I am having a problem with the File Manager where after I try to upload a file the thumbnail appears as a blank image and the file size displays as 0k. I have double checked the permissions on the files folder and they are set to 777 and have checked the umask settings.

I first had this problem running my site on a Linux server with Apache and PHP 5.1 and have moved the website to another server running PHP 5.2 and continue to have the same problem.