Having the same problem here!
I was using the lanes effectively in earlier versions of Cubase. Not working now with 9.5.10 installed.
I have an Intel HD Graphics 3000.
Having the same problem in Cubase 9.5.10 build November 28, 2017. This was not an issue in earlier versions for me. Getting a new graphics card doesn’t really sound like a solution. Cubase support - is there a fix for this? Stopped dead.
I bought a new graphics card with GT730 and problem went away. Doesn’t seem like this should have been necessary but…