In Windows 10 FCU 10.0.16299 Build 16299 using Wacom driver version 6.3.27-2 and Photoshop CC 2018 (19.0 20171103.r.190) the Select and Mask workspace immediately closes as soon as I use the Wacom Intous Pro tablet to zoom in/out. This happens using both the touch ring and my fingers on the tablet area to pinch/pull for zoom in/out. As soon as I take my fingers off the tablet (either the touch ring or the pen surface doing pinch/pull) the Select and Mask workspace closes and I lose and selection changes I did in the workspace as if I hit the cancel button or the Esc key.
The problem also happens in the older Refine Edge tool. Soon as I use the table to zoom in/out the Refine Edge tool closes.
I have used the same tablet with the same driver level on a Mac with High Sierra installed and the same version of Photoshop and it works properly there. I have opened a ticket with Wacom and at their suggestion have completely uninstalled the Wacom drivers and Photoshop then reinstalled everything. The problem remains.
This issue makes it impossible for me to use the Wacom Intuos Pro in Select and Mask.