First off, call Adobe.
Following has risks, might take a good two to four hours
Second off, perhaps try removing Lightroom again, but this time more aggressively, more complete
Mind you have copies of the files (perhaps to an external drive) under
Program Files (x86)\Adobe
and your user folder, the Roaming files (the Adobe folder)
and your catalog
Yes, use the Adobe Creative Cloud Desktop application to uninstall Lightroom,
then use your Windows (if MS) APP & Features (Ok, assuming Win 10) to remove any leftover old LR that lingers, and the Adobe Creative Cloud Desktop
Then run the Adobe Creative Cloud Cleaner Tool
Consider running a registry maintanace/repair tool
re-install the Adobe Creative Cloud Desktop
And reinstall LR.
Note that after all that, you will be looking at copying or importing presets from your copies, and reinstalling plug-ins. etc.
If you are really adventurous,you could remove all the Adobe products, get rid of the Adobe file folders other than your catalog, And re-install everything, not just Lightroom, as more and more components and file locations are being shared in the Adobe CC applications.
Thanks David I will give your suggestions a try,
Ok, I placed last posting in wrong place. Useful info however. Just not relatd to issue.
I have the identical issue after upgrading. The only reason I upgraded was so I could import at catalog that was created with a newer version on my laptop. Did the above suggestions work?