... Maybe its a problem with the file type afterall, and not the old-ish graphics card....
Yeah, the PC I use as a MC client in my entertainment center is not recent. I plan to replace it next year to install a Win11-based replacement.
The current crop of Intel video chips seem to be quite good enough for my needs going forward.
Indeed, the current MC PC has an Intel video chip, but Intel stopped providing drivers for Win10. So when I moved it from Win7 to Win10 that's when I switched to NVidia. I had to get an old NVidia card for the old bus in the PC.
All this is to say the following...
The workaround you provided in a prior comment works quite well for me.
So... if I am the only person who noticed this issue, don't waste time trying to resolve the issue I had been seeing.
I'm good here.