Compatibility Report, compiled by Claude from my troubleshooting chat.

steam-1203620.log

enshrouded.log

Name of the game: Enshrouded
Steam AppID: 1203620

System Information

• GPU: NVIDIA RTX 3060, driver 595.84.0
• Distro: Linux Mint 22.3
• Proton versions tested: 9.0, 10.0, 11.0, Proton Experimental, Proton Hotfix, GE-Proton (latest) — all fail identically
• Steam client: tested both stable and Beta — same result

Symptoms
Game was working normally when last played two days ago. Played a different game yesterday, then today the launch fails with the game's own "Your Steam client is not running!" dialog, despite SteamAPI_Init() succeeding. All other installed games work normally.

Proton log (steam-1203620.log) shows:
fixme:steamclient:manual_convert_Set_SteamAPI_CCheckCallbackRegisteredInProcess_func_156 not implemented!

Steam client log shows repeated assertion failures right after game launch:
src/clientdll/interfacemap_client.h (5617): Unknown IPC call IClientNetworkingSocketsSerialized::0xaf9f21ff
src/clientdll/interfacemap_client.h (3534): Unknown IPC call IClientRemoteStorage::0x8694e986
src/clientdll/interfacemap_client.h (3897): Unknown IPC call IClientHTTP::0xe12de80b
src/clientdll/interfacemap_client.h (3133): Unknown IPC call IClientUserStats::0x731946ee

Associated Valve crash-report IDs from these assertions:
bp-006f285a-c768-4229-a928-054fa2260904
bp-5f791c99-0630-47a6-9b0e-c0e4f2260904
bp-fce1591c-de88-4e20-959f-117d52260904
bp-0776eccf-e414-4cb5-9f3f-bf5042260904

Enshrouded's own log confirms the game-side failure point:
[E] [online] Could not get current user stats.
[E] [achievement] Could not create provider. Error: internal
[X] FATAL ERROR: Online_InitializationFailed

This suggests lsteamclient's interface map doesn't yet recognize interface
versions Enshrouded's latest build calls for IClientUserStats, IClientRemoteStorage,
IClientHTTP, and IClientNetworkingSocketsSerialized.

Reproduction: 100% reproducible on every launch attempt today.