PyCharm 3.4 ignores breakpoints in PyQt project

PyCharm 3.4 ignores breakpoints in my PyQt4 project. I've tried to set breakpoints in different places - even in the main function - all breakpoints are ignored, the program just runs through. I've checked all possible settings and 've got no clue what's wrong. There's no errors or warnings in console. Please, help me.

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