Upload issue...
 

This doesn't seem to affect all clients, just some, i have instructed people to clear cookies to ensure this is not the problem, I have checked permissions and registered users (both the group and the categories) have access to upload files, teh directory is chmod 777 and i have cleared the upload directory to ensure its not the problem, here's the error message:

Unable to create image [/home/httpd/vhosts/ucforums.com/httpdocs/photopost/uploads/373/100_4564.JPG].Please contact system administrator.

What causes this message and what can i do to resolve it or further diagnose it?

That 373 as well as uploads directory is 777?

Is you delete that images do uploads work for the individual?