Crimson Moon Wiki
Crimson Moon Bugs and Known Issues
Updated September 4, 2026
ProbablyMonsters maintains a public known-issues list. Open items include crashes during combat and ray tracing, a host crash in Ramshorn Keep, several co-op session bugs, and an identified issue where existing save data can be lost when updating the game. Patch 1.0.0.1 has already added PC key remapping; Hotfix 1.0.1 is in preparation.
Already Fixed: Patch 1.0.0.1
The single biggest launch complaint — no keyboard and mouse remapping on PC — has been addressed. Patch 1.0.0.1 (build 162350) added basic keyboard and mouse remapping along with mouse sensitivity controls.
The developer described this as a first Alpha implementation rather than the finished feature, so expect further refinement. It is nonetheless the change that turned the Steam review trend around.
Open Issues: Stability and Saves
- Crashes during combat and general gameplay, including ray-tracing-related crashes
- Host crash when entering the second arena in Ramshorn Keep
- Existing save data can be lost when updating the game
- Steam and Steam Deck save synchronisation failures
- Account issues that prevent the Main Menu from loading
- Shader compilation stuttering on the Epic Games Store build
Open Issues: Co-op
- Incorrect 'Player has left the session' messages
- Client freezes and disconnects in Moore Manor
- Co-op invitations can strand the joining player on the title screen
- The host may not receive mission progress credit during co-op
- Friends List problems on PlayStation 5 and the Epic Games Store
Open Issues: UI and Encounters
- Duplicate boss health bars during certain encounters
- An additional health bar during the Tyrigon encounter
- Felwyl's death sequence can be skipped with certain attacks
- XP values displaying with incorrect decimal places
- Repeated or excessive HUD notifications, and Mission Failed screen issues
- Oversized interaction areas around dropped loot
What Hotfix 1.0.1 Targets
Hotfix 1.0.1 is in preparation and is planned to cover the issues above alongside additional stability, UI, audio and localisation fixes. Full patch notes will be published when it ships, so check the Steam news feed rather than relying on this page for the final list.
Protecting Your Progress Right Now
- Back up your save before applying an update — save loss on update is a known issue
- Turn ray tracing off first if you are crashing in combat
- Confirm Steam Cloud has synced before assuming a save is gone
- Extract and purify after a good haul instead of pushing one more fight
- Play solo during the launch window if co-op disconnects are ruining runs
Frequently Asked Questions
- Is Crimson Moon buggy?
- The developer maintains a public known-issues list that currently includes combat and ray-tracing crashes, several co-op session bugs, and a save-data-loss issue when updating. Patch 1.0.0.1 has shipped and Hotfix 1.0.1 is in preparation.
- Can you lose your save in Crimson Moon?
- Yes — the developer has identified an issue that can result in existing save data being lost when updating the game. Back up your save before applying an update until that is resolved.
- Did Crimson Moon add key rebinding on PC?
- Yes. Patch 1.0.0.1 (build 162350) added basic keyboard and mouse remapping plus mouse sensitivity controls, described by the developer as a first Alpha implementation.
- Why does Crimson Moon crash during combat?
- Combat crashes, including ray-tracing-related ones, are on the official known-issues list. Disabling ray tracing is the first thing to try before reinstalling drivers or verifying files.