Comment #6 on issue 1612 by asmeurer: Symbol('f')(x) != Function('f')(x)
http://code.google.com/p/sympy/issues/detail?id=1612
And it is indeed the cache:
$SYMPY_USE_CACHE=no bin/test sympy/simplify/tests/test_simplify.py
============================= test process starts
==============================
executable: /sw/bin/python (2.7.1-final-0)
ground types: gmpy
sympy/simplify/tests/test_simplify.py[37] ..ff....
x + 1
x + 1
.............................
[OK]
======= tests finished: 35 passed, 2 expected to fail, in 14.08 seconds
========
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