I did an iris Trace to find out whats wrong. Here is the Packet that was sent:
SNIP
HTTP/1.1 500 Internal Server Error
Date: Fri, 06 Jan 2006 14:33:47 GMT
Server: Apache/2.0.53 (Fedora)
Content-Length: 621
Content-Type: text/html; charset=iso-8859-1Internal Server Error
The server encountered an internal error or
misconfiguration and was unable to complete
your request.
Please contact the server administrator,
root@localhost and inform them of the time the error occurred,
and anything you might have done that may have
caused the error.
More information about this error may be available
in the server error log.
--------------------------------------------------------------------------------
Apache/2.0.53 (Fedora) Server at einstein.phys.uwm.edu Port 80
I looked in the logs and found this:
[Fri Jan 06 14:34:26 2006] [error] [client XX.XX.XX.XX] Invalid URI in request X\\x98m\\xe2\\xc8\\r\\x16\\x9c+.(\\xd2\\x0e:\\x9d+*O\\x84\\x9bQ\\x9f\\bi\\xc6\\x01\\x15_\\xa6\\x18\\xd9\\x8e=\\xd4k\\x8a\\x
ae\\x99\\xc7\\xc7\\x86\\xeaK*a|\\x83Z&74\\xf3\\xf4\\xc6\\x14\\xef\\x97\\x8b\\xd3P\\x8c\\xe8\\x16\\x12y\\xba
[Fri Jan 06 14:39:39 2006] [error] [client XX.XX.XX.XX] request failed: error reading the headers
I think one of these is you but don't know what it means....

Still Upload Problem
)
Please see the 'failed uploads' thread in this problems and bug reports message board.