When this happens PD11 deselects hardware acceleration (HA) on it's own (previously selected as default) and the option becomes greyed out !
Saving the project (PD11 never actually crashes), closing PD11, restarting PD11, selecting HA, re-loading the same project puts everything back to normal until the next incident.
It looks like PD11 is getting hung up with video processing and gets lost in the process.
Any comments from experienced users with ATI graphics cards ? I have tried old and new ATI drivers with no difference. Win 10, i7