I am using Lightroom 4 and it has been working perfectly up until a few days ago - first, it began dragging (showing the rotating rainbow symbol in place of a cursor) and now is not loading at all (frozen at the opening Library page and has said "Loading" for the past hour.) The last thing I did before Lightroom started having issues was remove old image folders from the Library section that are no longer in use. Before that point, everything was great.
I'm using Mac OSX (updated to Maavericks.) Thank you for your help!