Thanks to all users reporting playback issues in the latest betas. We’re aware of the problem, which is easier to reproduce when playing some specific formats like VC-1 and MPEG2. It manifests as the app getting stuck with a spinner, like it’s loading the video, and then it crashes and closes (or you’re forced to close it manually).
We have fixed the issue and will release a new beta as soon as possible.
Thanks for your patience and sorry for any inconvenience.