Is this a new install? Have you been able to upload before and it suddenly stopped working? If so, have you recently made any changes or upgrades to either PhotoPlog or vBulletin itself (like upgrading to 3.6)?
Do you have access to your web server error logs? If so, see if there are any obvious errors being logged when you try to upload.
The more info you can provide, the better.
-- hugh
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