Same thing happens with IE, the upload box freezes on desktop folder. I had no problem until yesterday. I noticed that same problem occurs when I try to download something on desktop. I just deleted all the new files I had on my desktop, but no luck.
I would rather not use System Restore now and detect the problem and solve it. I have a web server on my windows and I don't know if System Restore affects the changes I made to it since yesterday.