HP Zbook 15 G4 Xeon E3-1535M w/ NVIDIA M1200 GPU drvr v386.01 per DS whql on NVIDIA Wab, Win 10 x64 Pro, 2 x external Dell P2414H displays w/ NVDIA the auto-select PhysX. All displays set same resolution & scale in Win settings. Downgraded NVIDIA driver to v386.01 from v391.33. Currently using Win10 multiple desktops feature. Currently using NVIDIA nView to prevent apps from opening windows off-screen. When hosted on external display driven by NVIDIA, DS UI works except for drawing area: mouse cursor disappears, expanding to full screen leaves visual debris. Screenshot attached. Suggests no refresh is happening in drawing area. When DS window hosted on native laptop display (Intel Graphics GPU), drawing area works as expected but usability severely impacted due to 15-inch screen size. System or NVIDIA control panel or DS setting that might fix this?