I'm having this same issue as well. Streaming video files off the net through various addons which support fast forward and rewind, full cache or not... Image simply freezes and i have to stop playback and restart from the beginning, very frustrating. It even persists in the Youtube addon. Pause and unpause works though. Edit: Weird... Using kodi now and seems the issue has disappeared. Probably fixed in 15.1 update. Anyway, disregard the above as I can fast forward, rewind or jump to a specific time during playback.