Rename not working, what could be wrong?

I have a large project in pycharm 3.4.1 which seems to be working, however when I do a rename on a variable (highlight, right-click, refactor->rename) I type in the new name and click refactor.  A processing dialog comes up then a dialog with a big red exclamation and "Operation is not supported" OK - pressing help on this brings up a not-found page.

This dialog isn't very helpful in telling what could possibly be wrong, is this a bug or is there a possible configuration error. Note: This project is using vagrant for the runtime environment and can be run-debugged.

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