Avatar upload error

Just checking it out and everything is fine until I actually upload an avatar.

At the top of the crop page, I get this:

Warning: getimagesize(http://homeschooljournal.net/avatar/ohyeah80straightcrop.jpg) [function.getimagesize]: failed to open stream: HTTP request failed! HTTP/1.1 404 Not Found in /home/homescho/public_html/wp-content/mu-plugins/avatar.php on line 221

And no pic is visible. Where are they plunked, anyway? (I'm gonna go read the code. )