In particular, whenever I use the brush with any chosen effect, LR will momentarily stop responding and then restart and the action with each stroke is delayed terribly. This is a brand new computer with the Nvideo GTX 1070 card and it is switched on in LR. 16 GB of ram and plenty of hard drive space. Worked fine before the install of the latest upgrade, but now, can't hardly edit with it. Am wondering if moving all the presets and stuff to the Camera Raw file didn't mess it up somehow.
Sorry to hear that Lightroom Classic CC is not working as expected since the 7.3 version update.
Could you please if the issue is reproducible if you uncheck "use graphics processor" under Preferences> Performance tab in Lightroom?
Let us know if that helps.
It did not. The only thing that really helped was to remove and re-install. It seems to be working right now. Hopefully I won't have issues going forward as this is my main editing program.