[HELP] QTGMC appears to not be deinterlacing footage (or not doing so correctly)

[Perseverant]

About the default settings changing, this is what is happening:
1) Launch Hybrid.  RESULT: Filtering is set to "QTGMC (Vapoursynth)" since it is set as a default.
2) Load one of the interlaced files, I've been working with.  RESULT: Filtering has now been changed to "TIVTC (Vapoursynth)"

Now, if I change the filtering back to "QTGMC (Vapoursynth)" and load a 2nd, 3rd, 4th, 5th file, etc. etc. it will stay on QTGMC.  It's just when I load that first file that it alters the default filtering method.  I didn't know if that was by-design, but if it is, it would be nice to have a 'retain defaults regardless of media loaded' option.

Personally I would filter more than just deinterlacing or IVTC, for example behalo, anti-alias, denoise, line darkening, luma sharpening,.... 

I know what you mean, and I bet you'd be able to come up with a great result.  I just reached a point in A:B testing where I don't have the time/energy to keep tweaking things, so had to stick with a more generic approach that produced excellent output after the upscaling was complete.