Everything gone black in 2017

[tricky]

I was merrily working away in 3dsmax 2017 using the blended box material. All going fine. I then added a vertex paint modifier onto my geometry and all the geometry in the viewport just went black. Not sure why. I've now deleted the vertex paint modifier and it is still black. I have tried numerous settings for the viewport shading method but nothing is working yet. I've even restarted max - no joy.

Any ideas?

I'm using a GTX 980Ti, so it should be fine I think.

[tricky]

Ah - problem solved. Please ignore.

[ior=0]

was it the very annoying 2017 default shading setting ? (black room, will all the lights turn off, setting)...very handy...you gotta love AD