Lightroom Classic Not Recognizing New Printer Profiles — Freezes on 'Other'

I've been making printer profiles for years using iMatch, and have had no problems with LR Classic until now. At the moment when I create a template and go to choose a profile to put in it, I either get 'managed by printer' or one or two old profiles even of different printers. After many hours of playing about (including trashing Prefs) the only way I can get the correct profile (from the sys32/spool/drivers/color windows folder) to register in LR is to edit the printer template (in the LR Settings folder) manually and delete the autoincluded profile and substitute the new one, saving the altered template. That seems to work and LR shows the new profile after closing and reopening. The one thing I must NOT do is to click on OTHER in the LR profiles list - that just locks LR solid, and the only way out is to use Task Manager to exit LR, reboot and start again!! I'm not the only one to find this - I read another post where clicking on Other did the same thing.

So what is the problem with the latest LR Classic? It never used to behave like this. 

Bob Frost