Comment #7 on issue 1612 by asmeurer: Symbol('f')(x) != Function('f')(x) http://code.google.com/p/sympy/issues/detail?id=1612
Well, I don't know how to debug a caching error. My fix is at https://github.com/asmeurer/sympy/tree/1612 if anyone want to take a look. I have added the print statements as the latest commit so you can see how it behaves.
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