Womble only cuts on I frames, unless you re-encode the sequence joins.
If you do frame accurate cuts in something else, and do not re-encode the joins, the video will be out of spec, because each GOP containing a join will not have 18 frames (or 15 if you're in PAL land).
Because the GOP is out of spec, your player doesn't recognize the disk.
If you want to do it right, you need to re-encode the cut video, or purchase a player that's not so fussy.