Synchronize doesn't work :-(

I am using PyCharm Community Edition 3.4 on MacOSX 10.9 and I got a problem with the synchronize feature of PyCharm.
I marked the Option "Synchronize on Frame Activation" in the Settings, however when I make changes on a file, close the tab and reopen the file
in Pycharm, the changes are still there, it does not reload the last saved state of the file as promised.

Any Idea what's wrong?

PS: All autosave features are off, of course

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