Now that's insane. Look around, you have NT drivers! In filemon and drwatson logs, there are mention of dlls which don't belong to drivers you posted: SDIMF32.DLL, QDPRINT.DLL, SD32.DLL, SDDM32.DLL, SR32.DLL, ZGDI32.DLL, ZSPOOL.DLL, etc. Wtf? It's possible that's NT drivers and they started to work with RC5 but not well ofc. Tell me where to get these files, or i'll have to treat this an invalid situation and not a regression.