Hi ho! As some of you have discovered, there's an issue when you upgrade to the nvidia driver 565.
If you've already upgraded, roll back.
If you haven't upgraded to driver 565....good. Don't.
We're currently working with Nvidia on the issue.

The issue is only present when Karma XPU uses Optix.

When running Karma XPU with Optix, a number of issues may happen, ranging from bounce lighting being tinted cyan, to the device completely failing on a "cudaErrorIllegalAddress" message.

We'll let you know when we have more information.

20.5.397 contains a potential workaround/fix for this driver issue that we're testing on our end. If you have an nvidia 565+ driver installed already, give 20.5.397 a shot and see if that's any better for you.