Cycles won't render

Hi I am getting the following error:

CUDA error at cuCtxCreate: Misaligned address.

and cycles/my GPU won’t render.

This occurred after making some tweaks to use the GPU, change tile settings etc, covered in this video:

Blender renders fine if I go back to the CPU.

Any thoughts on how to roll this back. I have already rolled back the theme and UI things I had changed.
Thanks for your time.

Fixed. Fixed itself after pc reboot.