Unspecified Error -- Stuck at 32% on Mac Client

My game was working perfectly fine until a few days ago when this message suddenly appeared when I was trying to log on. I have tried everything I can think of to get it to work--restarted computer, uninstalled then reinstalled LOL, tried deleting RADS solution file, tried letting it just sit open for a day, tried changing to public domain status--but nothing is working. Is anyone else having this problem/knows a solution?