Tried to do some searching on some earlier threads but didn't find a resolution or thoughts for why this is happening:
If I have subtitle on (usually an SRT), then I can't FF/RW, but the movie plays fine. If I stop the movie and turn off subtitles (NONE) and play the movie again, then I can FF/RW as normal. This is for an MKV video file. Same behavior for all of my video files.