There is a bug with latest version:
1. play video
2. touch screen, GUI appears
3. pause video, using center button
4. unpause video, using the same button
5. when playback starts again, whole GUI stays on screen but it should behave like in stock Media Player - should disappear.

There are some problem with thumbnails - sometimes, after video playback they aren`t generated/refreshed for that file, showing black square instead of the last played frame. I had to use stock Media Player to play file and generate thumbnail so it showed again in OMP.