I'm having pause issues in rev8-test3 (803) on 10.5.6.
When unpausing a video via the spacebar, it will play approximately 3 - 5 frames with sound and repause itself. I have to hit the spacebar, on average, 5 or 6 times to get it to return to playback.
Let me know if you need any more information.
I also just wanted to say that the default position of the controller in fullscreen feels a bit unorthodox to me, personally.