Clear should not have any effect on the GPU memory.
Clear
My idea when suggesting to reboot was more the following: When putting a computer in a sleep mode and using it again, the GPU might be in a weird state and WL may have problems to connect to it. I wanted to make sure that was not the case.
After a re-start of Mathematica the problem does not occur again.
My assumption is that *Clear["Global`"]** on top of the notebook does not clear the GPU memory and this was the reason for the failure.
What is the best command to start this kind of notebook (re-)evaluations with a clean memory of all needed devices?
Just run the command that fails. And after that, evaluate:
Internal`$LastInternalFailure
(as suggested in the error message)
Then copy paste the output here
Yes, I am running V12 on Windows 10.
I do not know what the "content of Internal`$LastInternalFailure after the failure" is. How to get it?
What is the content of Internal`$LastInternalFailure after the failure?
Are you running a 12.0?