So, after WEEKS and WEEKS of testing, surfing forums, Reddit, etc. etc., here's what I think I know.
LRC V. 12 IS compatible with Win 10, and Win 11 but it is NOT compatible in a Win10 updated to Win 11 environment.
I'm almost 100 percent positive of this.
I have three NVMe drives which have
1. Clean copy of Windows 10, Installed last monday
2. Copy of Windows 11 UPDATED from Win 10 - this has been my working drive since I bought my computer. Udated in May 2022
3. Clean copy of Win 11 Installed today
Clean copy of Win 10 + LRC V.12, zippy and awesome. No unexpected lag, program loads in 10 seconds
Clean copy of Win 11 + LRC V.12, So far, excellent, no lags, program load in 10 seconds.
My orginal C: drive, with Win 11 udated from Win 10 + LRC V.12 is HORRIFYING. Impossibe to use, slow to load, lags, hangs up, takes ages to copy/paste adjustments from one image to another and will often crash on copy/paste. Otherwise, the entire screen, THEN both side panels reload.
I'm going to go check one thing in a minute: I'm very curious if LRC's system is seeing Win 11 now. In my updated system, it was seeing Win10 even though the OS I was using was Win 11 updated from Win 10. I am pretty sure this is the seat of the issue.
I am using exactly the same LRC catalogue in each of these environments.
Otherwise, as noted, have been on many forums, Reddit feeds, chats and it is emerging - because I'm asking - that the Win10 - Win11 update does NOT support LRC V.12.
More to come....
@JCVPhotography,
It seems to me that you have answered this problem for yourself. Since the Clean Install of Windows 11 works perfectly, then there is something seriously wrong with your Windows 11 upgraded from Windows 10.
I tried my own test Windows 11 system (a clean install), as I am still using Windows 10 for my real work, and it worked fine with LrC 12.1.
I had this sort of problem for a long time with Windows 7 years ago, where LrC was very slow to start up, crashed often and had other mysterious problems. Eventually, I decided to start over, back up everything, do a clean install and restore everything. All my LrC problems vanished. Fast to start and no more mystery crashes or issues. I know it's a big job, but I would say it's your upgraded Windows 11 system that is at fault.