3d preview not happening

Hi,

just installed dynamo (0.8.1.1942). I don’t see any 3d preview either in the background or in a Watch 3D window.

Running revit 2016 on windows 8.1.

any ideas what the problem might be?

 

 

https://github.com/DynamoDS/Dynamo/issues/5054 and https://github.com/DynamoDS/Dynamo/issues/5033

thankyou, all good now - updated my graphics card driver.