I had a situation where I was looking through replays and jumped into a group that were all the same race.  Really wierd.  I'm positive they were the same race as I had to calibrate the wheel as the grid was set and saw my car steer right/left, then accellerate and quickly brake at the green lights.  I don't know why, but I viewed about 15 of them, deleting each one as I viewed, and they were all the same.  Different file names and different file sizes.  Strange...