At first I just assumed this was a steam problem, however with 1.12.4 coming out shortly this might be due to someone adjusting the steam side for its release. The people having the problem only applied to KSP. Work Arounds: Uninstall steam and reinstall (drastic thing to do with all the other games already connected) Create a shortcut directly to the PC executable which is KSP_x64.exe bypassing steam completely. Bug Report with Screenshots: https://bugs.ker