3D preview/ 3D watch not working

I cannot see 3d view of my code.
Attached please see image.

I am using dynamo studio 1.2.2.373
I tried it with REVIT 2018 and dynamo 1.3, but the issue remained same.

Operating sys: win 10 64 bit

perhaps a little bug ? it worked for me

Search the forum for backround preview. It’s likely a graphics card issue.

Apparently, this is an issue with the Dynamo Studio. I, too had this bug a few days back and I reported about it to the Autodesk Customer support. They said that it was a bug and they still are on it. You can use the Dynamo plug-in because it has fewer bugs and the work environment is the same.

Here’s the link tho the Bug issue repository.