To actually see the real framerate, while playing the file press ALT+3. In Mediuf framerate field you will see something like 24,97 or 25 fps.
Even if that field displays 50 fps, the file will actually play @ 25 fps, so any subtitle will work OK.
Try to change rendering methode (rightclick-> options -> preferences -> video -> rendering methode (right tab). Select for example Internal renderer and see if something has changed.
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