Once I enter the server, I get an error saying:

String: Interface\FrameXML\MultiActionBars.lua
line: 52
count: 1
Error: attempt to index global
VIEWABLE_ACTION_BAR_PAGES (a nil value)

------------------------------------------------------------------------------------------------
String: Interface\addons\Clock\Clock.lua
Line 377
Count: 1
Error: attempt to call global 'GetCurrentPosition' (a nil value)

I'm guessing this is a problem with the Cosmos UI. Now, I upgraded it after I downloaded the patch. Anyone know what I'm doing wrong?

I disabled all addons, and get the same thing. I also noticed whenever I press B I get another error. Should I just try and reinstall WoW?