This usually indicates that the PHP build on your server does not have the GIF and JPEG libraries incorporated. You'll need to check with your host to insure that your PHP build has image support enabled.
Did you recently move to a new server or have PHP upgraded on the server?
Thanks
Mark
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Mark Ferguson
President - Drive Thru Online, Inc.
Drive Thru Online – Helping Turn Your Passion into Profit
Please be sure that you selected the option to use vBadvanced in the options.
You will also need to rebuild the thumbnails for vBadvanced.
If you are having issues with this still please visit the Customer Sign In and create a ticket, include information that will allow us to access via ftp and the admincp.
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Nathan Freedenberg
Director - Product Support
Drive Thru Online