JS-R reported a bug the other week, which I just got around to looking at. The button for deleting ethnicity groupings was not working. It turned out that there was a missing quote mark in the code which creates the button, so although it looked OK, the click event was not hooked up to the delete routine. It's possible that other bugs reported by students (probably using IE) might have been caused by this same issue, so I'm now waiting to see if JS-R can reproduce any of their reported issues.