preview broke after latest update

[defaultjodoquszpsuf]

Dead pixels, broken images on Lightroom after the latest update (8.1) on desktop.  Images seem to have corrupted data. Can't get any work done. 

[Rikk Flohr: Photography]

Please provide the current Mac OS version number:
Please provide Model Number of Graphics Card
Please provide the year of manufacture of your Mac. 

[defaultjodoquszpsuf]

14.6.1

AMD Radeon Pro 5500M 8 GB
Intel UHD Graphics 630 1536 MB

2020

Thanks!