Getting a white screen

Hi,

On one of my sites Magic Post Thumbnail returns a white screen about 10 seconds after I click “Generate Magic Post thumbnail.” It’s working on my other sites.

Here’s the URL with the white screen: http://politiseek.com/wp-admin/options-general.php?page=mpt&ids=6832%2C6831%2C6830%2C6829%2C6828%2C6827%2C6826%2C6825%2C6824%2C6823%2C6822%2C6821%2C6820%2C6819%2C6818%2C6817%2C6816%2C6815%2C6814%2C6813%2C6812%2C6811%2C6810%2C6809%2C6808