1) set pre-roll to 1 sec and turn on loop-playback.
2) make a selection.
3) hit play
notice the picture go black like the blink of an eye exactly at the in-point of your selection after the pre-roll.
Only happens when pre-roll and loop-playback are on. Without loop-playback it works fine.
New bug in 11.2.2
Update 2 June 11:
So far I've seen this happen on every PT version after 11.2.2 incl. PT12. OS-Version doesn't matter. It only affects systems with video hardware present. I think it's definitely a PT bug because the BM driver also has no effect on it. Something broke when version 11.2.2 came out and it hasn't been fixed yet.
See DUC-thread for details.