Official known issues list
Activision and Infinity Ward publish issues in two places, and the lists are not identical. The support page has four entries, the Trello board many more. The table combines the most important ones from both (read October 24, 2026). Statuses are as shown on the pages: "Investigating" or "Fix Scheduled".
| Problem | Platform | Status | Workaround |
|---|---|---|---|
| Loadouts do not save in multiplayer | all | investigating | no official one (see below) |
| No stats in Combat Record and Leaderboards | all | investigating | display issue only, stats are still tracked |
| No button to launch the game from COD Home | Xbox on PC | investigating | 10-device limit, install missing Content Packs |
| Cannot Prestige an Operator in DMZ | all | investigating | equip Rare weapons with only three attachment slots |
| Free Loadout in DMZ loads into the match with no weapons | all | investigating | none |
| Military Camos and Apex Attachments relock after weapon prestige | all | investigating, fix scheduled | none |
| Kicked from the game while spectating in multiplayer | all | investigating | none |
| Player models in static or incorrect animations | all | investigating | none |
| DLSS unavailable while VRRT Denoiser is enabled | PC | board note, working with NVIDIA | pick one of the two |
| "Update Requires Restart" prompts after connection timeouts | PC | investigating | none |
| Sprint or Melee does not exit ADS with Toggle ADS on | all | fix scheduled for Season 1 | none |
| EULA shown in English during first setup | Switch 2 | investigating | install the language pack |
For the regional map animation shown while searching for lobbies, the studio disabled it temporarily because it was suspected of causing hitching on Xbox and PS5.
Sources: the Activision list and the Infinity Ward Trello board, read October 24, 2026.
The support page version of October 23 speaks generally about "launching the game", while the October 22 version named "Content Pack 1" and the Campaign and DMZ modes directly. Officially, Activision advises installing any missing Content Packs.
Loadouts not saving
This is the most reported bug after launch. Activision: "An issue preventing some players from saving Loadouts in Multiplayer is under investigation." It affects all platforms, with no fix date.
Before you call it a bug, check one thing. According to the October 21 patch notes, Weapon Builds in Gunsmith no longer save automatically when you leave the menu, because that cluttered the build list. Saving is now manual, while builds edited during a match save on their own. Some "unsaved" changes are therefore new behavior, not a bug. Activision does not say whether the Loadout reports come from this change or from a separate bug.
How to limit the damage:
- After changing a weapon, save the build manually before you leave Gunsmith.
- After entering the lobby, check that your attachments did not revert to defaults.
- Keep your own builds in a note as well. Ready-made setups are in best weapon builds.
Players reported similar symptoms (vanishing attachments, a "stock M4" after entering a match) already in the August beta, and the beta patch notes mentioned a fix for Loadout saving. At launch the symptom came back.
Dev Error codes (player reports, unofficial)
Activision has not published a list of MW4 codes with descriptions. The codes below come from r/modernwarfare4 threads and are player accounts only: nothing here is guaranteed, and many people write that nothing helped. A "Dev Error" with a hex value is a shared label for different causes.
| Code | Platform | What helped some players | Thread date |
|---|---|---|---|
| Dev Error 0xB7396204 | Xbox Series X|S | changing the console region and language to Spain (you can switch back later), deleting local saved data, waiting 1-2 minutes on the error screen | October 23 |
| Dev Error 0xA2ED20A4 | not stated | the game fails to load after playing DMZ; no answer in the thread | October 22 |
| 0x00001338 (KERNELBASE.dll) | PC | verifying files, Memory Integrity and Kernel-Mode on, turning off ray tracing and frame generation | October 16-17 |
| 0xc0000005 (ACCESS_VIOLATION) | PC, Xbox app | uninstalling and reinstalling only the DMZ pack (about 5 GB) | October 20 |
| 0x887A0005 and 0x887A0006 | PC, Radeon | turning off ray tracing or setting it to Low | October 17 |
For Dev Error 0xB7396204, the threads say other methods (restart, clearing the MAC address, clearing the cache) usually did not work. Nothing in this table is confirmed by Activision.
Network messages ("Lost connection to Host", "Unable to connect to host") were reported in different countries and on different platforms on October 21-23. Restarting the lobby search or the game helped, and the suspicion falls on the servers, not on your hardware.
PC crashes
Drivers: Activision versus newer releases
Sources disagree here, so honestly:
- Activision (page of October 1, 2026) recommends: NVIDIA 616.56, AMD 26.7.1, Intel 32.0.101.8974.
- NVIDIA released Game Ready 621.01 WHQL on October 21 with MW4 support, DLSS 4.5 and Advanced Shader Delivery.
- AMD released Adrenalin 26.10.1 with new MW4 support. Its "Fixed Issues" list includes stutter in MW4 on Radeon RX 6000 series and newer.
A sensible choice: the newest vendor driver, and if things get worse after the update, go back to the version on the Activision list. Check your version with Win+R, dxdiag, Display tab.
Shaders and stutter
Advanced Shader Delivery (precompiled shaders) needs Windows 11 24H2 or newer and a driver at least: NVIDIA 621.01, AMD Adrenalin 26.6.1, Intel 32.0.101.9150. The shader database arrives with the download through the Xbox app on PC. For the Steam and Battle.net versions, FPSReview writes that the driver does not shorten the shader wait.
Stutter in multiplayer is reported by owners of powerful PCs too, but also by PS5 and Xbox players, so the cause may sit on the server side. Player opinions from one thread (single confirmations, not a method): a lower "VRAM scale target", Local Texture Streaming Quality on Low, Frame Generation off, an FPS cap a few frames below your refresh rate, and closing overlays (Discord, GeForce, Xbox Game Bar).
Players also mention manual edits to the config file (DxrMode, RendererWorkerCount in %LOCALAPPDATA%\Activision\Call of Duty\players\s.1.0.cod26.txt). This is advice from individual people, not confirmed by Activision, and the author of one tip wrote that he was not sure of the effect. If you try it, back up the file first. Turning off ray tracing in the game menu is usually enough.
TPM 2.0 and Secure Boot
The most common reason for "the game kicks me out" or missing online modes. MW4 requires TPM 2.0 and Secure Boot, and without them online modes are blocked. Windows 10 must be version 22H2 or newer.
- In the BIOS set UEFI mode (not Legacy/CSM) and enable Secure Boot.
- The system disk must use GPT partitions. Converting from MBR:
mbr2gpt /validate /allowFullOS, thenmbr2gpt /convert /allowFullOS(turn off BitLocker first). - On first launch, approve the CODBrokerInstaller.exe UAC window with the administrator password. "No" or closing the window blocks the game.
- If the
enrollaik.exeprompt keeps returning despite "Yes", Activision says it is a firmware problem: boards with AMD TPM version 3..0. need a BIOS update. - Check your PC with the Secure Attestation Wizard (version 1.3.0 from October 21, 2026).
What else Activision and players recommend
- Close background apps. Overlays, input remapping and recording software can disrupt the game's startup, even when not running.
- Verify the game files (Steam: Verify integrity, Battle.net: Scan & Repair).
- If the game starts on the integrated GPU, pick the right card in the system graphics settings (a player report).
- Crashes that restart the whole PC with an RTX 5090 and a Ryzen 7 9800X3D were blamed by most commenters on the power supply or cooling, not on a game bug.
Hardware requirements and graphics settings: PC requirements and settings.
Consoles and Switch 2
PS5. A crash ends on the home screen with "Error code CE-34878-0" or "An error has occurred with an application or system software". Activision advises: restart the game, update the system, mind cooling, delete old data. Players stuck on an install screen after downloading all packs: Settings > Users and Accounts > Other > Restore Licenses, then restart the game. Choppy campaign cutscenes went away for one player after turning on Performance Mode 60Hz+.
Xbox Series X|S. Crashes most often in the lobby before or after a match. Activision steps: update the console, clear the cache, reset the Alternate MAC Address (Settings > Network > Network settings > Advanced settings). Remember the 10-device limit on a Microsoft account, which blocks access to the game. The Dev Error described above mostly concerns Xbox.
Nintendo Switch 2. The only official known issue: the EULA and privacy policy in English when the language is not installed. Install the pack like this: launch the game, the (+) icon in the top right > Language Settings > pick a language > Yes > Download, then restart the game. For a crash, turn the console fully off (not sleep) by holding POWER for at least 3 seconds, and turn on crash reports in Settings > System > Share Error Information.
Missing Content Packs
The game is split into packs: campaign, multiplayer, DMZ and a shared "Shared Content Pack". PS5 players (including disc owners) wrote on October 23 that without Shared Content Pack 01 the game does not start until you download all modes. On Xbox in the beta, being stuck on "checking for updates" went away after installing the Campaign, Multiplayer and Warzone packs.
- Xbox: My games & apps > See all > Full library > All owned games > Call of Duty: Modern Warfare 4 > Install all.
- Xbox on PC: in Library, untick the "Installed" filter if you cannot see the game.
- PS5: automatic downloads may skip the choice of components. Turn them off before pre-install if you want to choose.
- If DMZ alone crashes on first entry, one player fixed it by reinstalling only the DMZ pack.
Activision has not published a full list of packs with sizes. Overall game size: release date, size and editions.
How to check server status
- support.activision.com/onlineservices: the "Call of Duty: Modern Warfare 4 Server Status" page. If your platform's indicator is not green, the connection may be unreliable until service is restored.
- @CODUpdates on X: critical news about issues, fixes and patch notes. @InfinityWard and @CallofDutyCM are also useful.
- The Infinity Ward Trello board: the "Matchmaking Quality and Stability" card has the Monitoring status.
- Platform network status: Xbox (support.xbox.com/xbox-live-status), PSN (status.playstation.com), Battle.net, Nintendo.
- A connection test on the console (for example Xbox: Test multiplayer connection) and an Ethernet cable instead of Wi-Fi.
The studio asks players with matchmaking problems for recordings with the Server Latency telemetry on: Settings > Interface > Global > Telemetry = Essentials.
Lobby search times can be long: players on the US West Coast wrote on October 24 about more than four minutes and being placed on East Coast servers. Media also reported that Open matchmaking playlists were missing from multiplayer at launch (Vice, October 22).
Patches since launch
| Date | What changed |
|---|---|
| October 13 | board fixes: recording software (for example NVIDIA ShadowPlay) causing hitching on some PCs, FPS drops with Quick Draw in ADS |
| October 19 | an additional server-side fix for the campaign on Xbox on PC |
| October 20 | campaign and DMZ update: DMZ crashes, a crash at the door in the Breaking New Ground mission, 0 XP in the After-Action Report after the first match |
| October 21 | launch patch notes: a server crash in MP matches, visual bugs on the Cachette map, PC performance with the Heartbeat Sensor; DMZ disconnects fixed (you keep your starting kit and progress, but not the loot from the match) |
| October 22 | small update: parties of 4 in Free-for-All, retaking UAV Towers in DMZ |
| October 23 | new known issues (spectator kick, static models); Toggle ADS fix moved to Season 1 |
As of October 24 we found no confirmed big hotfix after launch. We know the @CODUpdates posts from quotes and the Trello board, because we could not open the profile itself. Coming up: Shipment on October 27, Possession on October 29, Infected on October 30 and Season 1 on November 6, 2026 (per The Click, citing the Infinity Ward roadmap).
FAQ
Why are my Loadouts not saving in MW4?
It is an officially known issue on all platforms, under investigation with no date. Also remember that Weapon Builds in Gunsmith now save manually, after you leave the menu.
How do I check Modern Warfare 4 server status?
Go to support.activision.com/onlineservices and follow @CODUpdates on X. Matchmaking trouble is also described on the Infinity Ward Trello board.
What does a Dev Error mean in MW4?
Activision has not published a list of codes. A "Dev Error" with a hex number is a general error, and tips from player threads (changing the Xbox region, reinstalling the DMZ pack, turning off ray tracing) helped only some people.
Does MW4 require TPM 2.0 and Secure Boot?
Yes. Without them online modes are blocked. You need UEFI, a GPT disk and approval of the CODBrokerInstaller.exe window.
Which graphics driver should I use for MW4?
Activision still lists NVIDIA 616.56 and AMD 26.7.1, but the vendors released newer ones: NVIDIA 621.01 and AMD Adrenalin 26.10.1 with MW4 fixes. If things get worse after the update, go back to the Activision version.
