I am not sure if this is the same issue as the OP and if not sorry to hijack the thread, but I regularly see the problem that Samson is describing. If I start watching a show after it has started recording, I can skip over commercials, etc until I reach the point the program was at when I started watching it. After that point, if I attempt to jump forward, it returns me to the point I was at when I started watching it. For example, a 1 hour program that starts at 8 PM. I start watching it at 8:15. I can skip forward during the first 15 min of the program (the program continues to record, so it may be 8:25 when I reach the 8:15 mark) . I can continue watching it after the 8:15 mark, but if at l the 8:20 mark a commercial starts and I hit skip, I am return to the 8:15 mark. If I press stop and the start watching the program again, I can use the fast forward functions up the new 'start' point. Very frustrating when the bookmark is lost and I have to return to the beginning of the program.
Alex