Reproduced in RC3. When going to the (funny) URL above, the image loads, but the page never stops loading; the throbber will spin forever.
WORKSFORME mozilla 1.0 rc3 macosx. hwaara: do you have pipelining or any other non-default networking settings enabled?
The server must have changed something. No, I am using the default settings. But argh, it works for me too now.
wfm too, verified