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So I was tweaking my node setup in the world background when suddenly everything turned grey.

Blender shading view with simple node setup for the world background with viewport render on and device set to GPU

I tried to undo the steps but nothing changed. A bit later, I switched my rendering device to CPU and it worked like normal, but a bit slower.

Blender shading view with simple node setup for Suzanne material with viewport render on and device set to CPU

I checked my preferences and everything seemed fine to me.

Blender User preferences window with Cycles Render Devices set to CUDA and GeForce GTX 1050 Ti box checked

When I hit render with GPU device, it says "CUDA error at cuCtxCreate: Launch failed"

Blender render window with said error

I checked my other blender files and the problem persisted.

I would search a bit deeper on the web normally, but I have to finish a couple of VFX shots for next week so I want to everything to work as fast as possible.

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Ok so it seems that restarting Blender resolves the problem. However I know that this solution does not explain the cause, so if someone knows what it is or how to resolve it, go ahead

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    $\begingroup$ I get this after I hibernate my system. It happens because a call to create a CUDA context failed, make sure you have the latest drivers and Cuda $\endgroup$
    – Moog
    Commented Nov 29, 2019 at 21:29

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