System Information
Operating system: Windows 10 pro 64
Graphics card: 1080TI

Blender 2.80rc2
Broken: Blender 2.80rc2
Worked: (optional)

Blender crash after texture baking with Cycles and trying to save to disk *

Exact steps for others to reproduce the error

1. Create a UV spere
2. add a Multiresolution modifier to it
3. Subdivide 3-4 times
4. Go to Sculpt mode and sculpt some strokes on the subdivided sphere.
5. Return to Object mode and add Material to the sphere
6. Go to Texture context on the Properties tab and add new texture 1024x1024 defaults is fine
7. Go to Shader editor and add new Image texture choosing the Untitled - previously created in step 6 texture.
8. Switch to Cycles renderer, go to Bake tab and for type specify Normal and bake (defaults tangents etc.)
9. Switch back to Texture context on the Properties tab and click Save - to save the baked texture.
10. After specifying where to save the texture in my case d:\Untitled.png click "Save as Image" => Blender crashes

I tried this on 3 machines with rc2 and rc1.

Thanks,
Martin