Did a quick search and couldn't find anything about the following discrepancy. According to the 921 manual, pressing the skip ahead button during DVR replay should advance the program approximately 30 sec. and skip back should go back 10 sec. I've used both while watching football and basketball games where the game clock is shown continuously on the screen. In my case, skip ahead advances 15 sec. and skip back is 5 sec. Is the manual wrong or do I have a quirky machine? Not sure if this is a good or bad thing. Takes more presses to get through commercial breaks, but does give you finer control.