I can't say a recording has been skipped, since I caught it before it could be skipped. I always use first run and rerun (default mode when you create a series record). I tried once to set first run only, and since MTS did not have the proper data, it made the guide think a first run program was a rerun (french TV show on SRC HD) and would refuse to record it.
The two cases where I caught the problem are CSI shows (Miami or LV). As I said, I don't know if the program would have been missed, but they were not in the list of scheduled recordings a few days before and reprogramming the series made them appear in the list. Both times it happened, the previous week, there was either no show or it was a rerun (christmas break, and now olympic break).
I have no clue if I actually missed other shows because of this. Since apparently I am alone to notice this, I will take the time to call them to let them know about the issue. Before spending 15 minutes waiting for CSRs, I prefer to verify it's a new problem.