Hi Josh, Hi David. I have the same problem over here, too. I'm trying to update the image using java jersey but all I get is error 500.
Searching the internet half a day, I also found a previous description of the problem posted in December 2008, but still no solution :-( http://groups.google.com/group/twitter-development-talk/browse_thread/thread/bec5efc1469b1d94 Cheers, Mitchel