I was initially hesitant to upgrade to High Sierra because I thought I would have trouble with a couple of 32 bit applications that I use a lot for which there is no upgrade.
BTW, I totally agree something is corrupt I just can't figure out what. I had a very similar, or possibly the same, issue with extensions showing when they shouldn't many many years ago and I can't recall how it was fixed for the life of me. Old age and memory are not compatible.
