Try the following that came from vBSEO support:
In vbseo.php file change this line:
PHP Code:
array(VBSEO_USERID_URI, 'action', 'userid', 'username', 'tab', 'page', 'pp', 'vmid'),
to:
PHP Code:
array(VBSEO_USERID_URI, 'action', 'userid', 'username', 'page', 'pp', 'vmid'),
For the record: This is a vBSEO bug/issue, the URLs in AUT & vBNotifs are 100% correct out of the box.
Fillip