I tested it tonight at a mac os, visiting a friend and everything worked as well as at my pc at home. It was not a full test, but I downloaded a bunch of album arts and the download worked pretty well, we only got problems with itunes, but thats another story...
By the way, another bug I recognized is, that the yahoo-search isn't working proberly. I can search and the result seems to be fine, but I am not able to download any stuff I searched from yahoo.
P.S.: The yahoo-problem is on windows xp, as well as on os x