I just installed the latest 8.90.7 Alpha on a RP3 b+ and at first I saw no issues. I set my Region, installed PVR-Mythtv and started watching a pre-recorded program. But I quickly noticed that the arrows that you use for Skipping forward and backward are not working at all. Up, Down, Right, and Left have no affect on the playback. Normally, you never have to setup the arrows. The arrows don't work on the keyboard or remote.
Jim A