That variable is established by the cbTabs constructor class. It's gone in CB 2.0 as tab JS usage has been rewritten with couple lines of jQuery. No idea why it's missing in your use case though as that's not possible. When the tab position function is called it establishes cbTabs and its JS. It's the same function used to output tabs on profiles. Review browser console to see if there's any other errors present as perhaps you've a conflict of some sort causing the tab JS to break.
Kyle (Krileon) Community Builder Team Member Before posting on forums:
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