I've looked at every forum post I can find regarding graphics cards. I have two Nvidia Geforce GTX 980M 8BG ram GPU's in my laptop. Since recently upgrading to 2017 and then 2018 less than a month later I get constant black screens in Vectorworks with 'Not Responding' in the title bar. These last for 20- 60 seconds and occur all the time. Even clicking on a menu button causes a 5 second pause before the menu drops down. Selecting an object line a Dimension, Wall or even a view port often isn't registered/shown as being selected.
Vectorworks doesn't crash it just pauses every time I try to do something.
I use two monitors rather than the laptop screen.
I have switched off SLI, forced Phys X to use the same GPU as the monitors. I've tried SLI left on, Phys X on the second GPU. I've tried Phys X on the CPU.
I'm completely stuck, this never happened under VW2014!