Sounds like a redirection problem.
Find on your server:
- includes/functions.php
- Back up the file functions.php (Just copy it to a temp file)
- Open functions.php, find and remove:
Code:
header('Status: 301 Moved Permanently');
- Then save functions.php (Make sure no spaces at the bottom of the page)
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Or, you could alternatively turn off the redirection in your AdminCP.
- Open AdminCP / vBulletin Options
- Find 'Remove Redirection Pages' and turn it off.
Hope these help.