futex_wait_queue_me Application freezes up

Ok, So I´m trying to use a transcription Program called “F4”

This program uses mplayer in slave mode, a media file gets played (audio - interview in my case), and I can pause (f4) skip back (f3) or forward (f5)

the f4 works fine for starting and stopping the playback, but when I hit f3 to skip back, the program freezes.

I went into the to look at the Processes, it says the Process is “sleeping” and it says “futex_wait_queue_me”

Any Ideas?