Certainly. Sorry if I was unclear, but most likely it's the age.
For black bar detection, I have always used madvr as long as it was a 2k movie. Unfortunately with 4k my RX580 video card, with active tone mapping and copy-back (essential for black bar detection), can't take it anymore.
While waiting for video card prices to drop, I was thinking of using MC cropping, which is very good.
Now I activate it manually the first time I put a BD UHD and I see that there are black bands, but I wanted to create a new area in which "aspect ratio correction> 1.78 output to 2.35 display" are automatically active (and this I succeeded ) that "crop black bars 2.35" which is what I'm missing.
If this is not possible, no problem being able to continue as I have done now.
Thanks anyway