It does not seem to be a common factor other hardware. We are having the with AMD processors, less RAM, no VR gear, no soundcard, different antiviruses, the only common ground besides the UE 4.19 seems to be NVidia cards and recent drivers. @Illusionray tested with old Nvidia driver and it seems to not have the (I myself can’t rollback to that version: 382.53 for Windows 10 64 bit)