When I run a scan, it tells me I'm missing every one of the thousands of romsets that MAME supports that I don't have. There used to be a place in the clrmamepro settings that would let me tell it which romsets I have, so that it would ignore the ones I don't have, and there was even an 'Available' button which would automatically select the romsets that I had zip files for.

I can't find that setting in recent versions of clrmamepro. What happened to it?