"uncaught exception: jQuery UI Tabs: Mismatching fragment identifier."

"uncaught exception: jQuery UI Tabs: Mismatching fragment identifier."

This has been driving me crazy.  I can not find a mismatching fragment identifier.  If there is one, what is the fastest way to find it?

But using google to search out this error, every hit I examined indicates it is due to an incompatibility between specific versions of jQuery and jQuery UI.  How does one distinguish between a real fragment mismatch and one due to such an incompatibility?

My next question is based on the observation that the versions of jQuery and jQuery UI are rather dated relative to what is presently available.  Are the latest versions of both jQuery and jQuery UI backward compatible as well as fully compatible with each other?  What is likely to break if I update both to the latest releases?  Yes, I saw jquery-migate, but have not yet found the documentation of how it is to be used.

At present, I am using:
  • jquery-ui-1.8.20.custom.min.js
  • jquery-1.8.3.min.js
Yes, I know how old they are, but this is in a production system in which changes/updates are not quick.

Thanks

Ted