I have been running LR Classic 7.2 on a Windows 10 x64 PC with nVidia 980Ti for some time without problems.
Yesterday, I tried the LR Classic 8.0 and everything seemed to be working except the Develop module. The Develop module is blank.
I tried disabling my Graphics processor (an Nvidia 980 Ti) but it makes no difference. My Graphics card worked fine in Lightroom Classic 7.2
I updated my nVidia drivers to the latest version 416.34 WHQL. It makes no difference.
Are there any other work-arounds for LR Classic 8.0 to try? I am ready to give up and return to older, but working Lightroom Classic.
Try completely signing out of Creative Cloud Manager, quitting Lightroom and reboot your system.