render after speed setting check on timeline

Power Pc G5, 10.4.11 3.5 gig ram, FCP 6.0.2

When I command J to check a clips speed or duration all of a sudden even if I don't change anything I get a red render bar when I close the box never had that. My timeline set to-safe realtime, dynamic, dynamic,full qty playback. It's kind of irritating.

Rick