Make sure you've uploaded all the PHP files which are appropriate for your version of vBulletin.
Else disable all your plugins (See:
Help! I've broken my board! for information on how to temporarily disable them)
Finally if your issue still persists, create a New Style with No Parent Style and test again.
(Maybe try upgrading to 3.7.1 or 3.7.2 ? Not sure why you just didn't skip straight to these as they only contain bug fixes to 3.7.0 really).