Well, people complain all the time that they have difficulties uploading photos, perhaps this is part of the problem.
If you reply here you can see what I'm talking about. Click on "go advanced" below.
When the new page opens, click on the attachments icon (paperclip). That pops up a new window. From there you can upload a file from your computer, which has always worked fine for me.
But if you use the upload from a url option it doesn't work.
Upload Errors
http://www.cornsnakes.com/forums/images/cas-01.jpg:
Upload failed due to failure writing temporary file.
This happens for me in IE9 and Firefox 13. I'm not the only one. Either the temp folder (eg. /tmp or c:\temp) hasn't been selected correctly or the web server doesn't have permissions to write to the folder. Either way it's a small fix.