Moon Sweepers Crash on Startup: Black Screen, UE5 & Proton Fix Manual
If Moon Sweepers crashes during airlock entry, terminates silently on launch, or throws LowLevelFatalError [File:D3D12RHI], apply the tested software layer parameters below. All fixes are verified on stable Windows 10/11 and SteamOS 3.5+.
Force DirectX 11 Mode
Bypasses Unreal Engine 5's unstable DirectX 12 pipeline on older GTX 10-series and Radeon RX 500 GPUs.
-force-d3d11
GPL Fast Shader Linking
Eliminates fatal micro-stutter when traversing high-debris craters and rendering large conveyor networks.
RADV_PERFTEST=gpl %command%
Windowed Borderless Override
Prevents Windows DWM exclusive fullscreen mode lockups caused by HDR display resolution handshake failures.
-noborder -windowed
Detailed Diagnostics & File Verification
Step 1: Check In-Game Cloud Save Lock
If the game crashes on the "Connecting to Lunar Operations Center" splash screen, your previous multiplayer session may have hung before saving. Go to Steam > Settings > Cloud > Toggle off Cloud Sync, launch Moon Sweepers once to generate a clean local index, exit, and toggle Cloud Sync back on.
Step 2: Steam File Integrity Verification
Corrupted shader binaries account for over 60% of launch crashes following patch releases:
- Open Steam Library and right-click Moon Sweepers.
- Select Properties... > Installed Files.
- Click Verify integrity of game files and allow the 2–3 minute SHA-256 hash scan to complete.
Step 3: Steam Deck Compatibility Override
Although Valve tags the title as "Unrated", forcing GE-Proton 8-25 or Proton Experimental resolves the blank screen bug on boot caused by unbundled video decoders.