Hi jd-free and welcome,
Recommend you follow signals' always sage advice.
In the event you still have problems, I'd look to your codecs, not sure if something is in conflict or you're missing the appropriate codec.
Anyway, install ffdshow. It's free and it once was essential for the preview window in Fab to operate correctly.
If it still plays in "inverted" view, try the following:
In ffdshow settings, there is a configuration setting to flip the picture.
Good luck and let us know.