I didn't see anything obviously wrong in the PHP config.
You might want to have a look on the vBulletin.com forum, there are a few threads on configuring and troubleshooting ImageMagick.
If that doesn't bring a solution, please consult your hosting company on the IM implementation on their server.
If all that fails, i suggest you open a support ticket, so we can have a more detailed look on your server.
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