Regarding the blank page as others have said likely a php error. You may if you are lucky find in the web root (public_html) directory an error_log file that the server has already created, the last few lines of this should reveal the cause.
If you are not sure ask your host, just tell them you are getting blank white pages with your script (Vbulletin in this case) and want to temporarily enable displaying errors, they should be able to point you in the right direction.
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