It does upload the files correctly, but the progressbar doesn't move.
Small files such as images go quite fast, but larger ones just seem to be stalling.

I just bought the pro version I installed as mentioned, however, it keeps throwing errors. installed on windows server 2003 IE: I get the "upload completed" error, as do many, it seems. Trying out all of the fixes mentioned in this forum doesn't work. If I comment the following line: "...