I was happy with the 'has transparency' work last week, but unfortunately some damaged animated gifs (usually where one frame was borked) were raising a serious error when then were inspected. This error, which was interpreted as a hard drive fault, was a false positive! If you got it (should have been a popup talking about an 'I/O Error', and that maintenance work would halt until the next boot), do not worry--it wasn't a big deal. I have fixed up the error handling and a bunch of other gif issues. Sorry for the trouble!