I would try deleting events one at a time to find the offending event. Or you could delete them all and redo them to see if if that was the problem. Of course, if you have hold overs from last season, getting the events back in there might be a problem.
I went though my recordings that had something in the schedule from thursday and friday, deleted the timers, then recreated them as suggested.
BINGO! That worked. Very interesting.
Thanks 8bitbytes!