Honestly don't even know how to explain this

[A Dead Puppie]

Upgraded to vB 4.2 from 4.1 and at the top of EVERY page it this:
======== Old Default Value ======== =================================== >>>>>>>> New Default Value >>>>>>>>

This is my homepage (http://machinimaevolved.net/)

I've reverted all of the templates back and i dont know why it's there

[Lynne]

Create a new style with no parent:

Styles & Templates > Style Manager > Add New Style
Parent Style: No Parent Style
Title: Default vBulletin
Allow User Selection: Yes
Save

Then browse the site using that totally default vbulletin style - do you still have the same problem?

[A Dead Puppie]

Nope, it's gone.

[Lynne]

Then your problem is with your custom style. You said you have reverted all templates, but you haven't. Take a look at all the templates that are shown in red in your custom style.

[Paul M]

If its at the top of every page then the header templates would be a good place to start looking.