Hi Josh,
First, please try the latest build here http://cutesoft.net/downloads/folders/52443/download.aspx, if you still get the same error, then please send me your uploader page url, so I can check on it directly. You can send the url to [email protected]
And you can try set property "TempDirectory" to another folder.
$uploader->TempDirectory="/xx/xx/mytemp";
Regards,
Ken