Attempting to go to a new tab in Ultimate Branding brings a "Are you sure you want to do this?&

I enabled the Admin Bar module, then when I try to go to it, either via the tab on the main Branding page, or via the menu item on the left, I get the classic/lame WordPress “Are you sure you want to do this? Please try again.” page.

Normally that error/page happens when trying to edit a theme file or do something else after too much time has lapsed, but zero time has lapsed when I’m trying to go to the new Branding tab. So I don’t understand why I’m getting that error, or how to make it stop.