Thanks for the reply. Hope it gets fixed soon.
A few set of drivers I rely on had updates pushed today, including Wacom (for the latest version of Intuos Pro tablets we're using). The latest Wacom update is 6.3.31-3 - it apparently has addressed the instability issues we've experienced with our tablets. In Touch, scrolling/panning/zooming/Smart Zooming all work as expected now. With the styli, all works as expected. The Touch Ring works as expected.
I personally tested Apple Maps, PS CC, Illy CC, Motion, Keynote, and Logic Pro X. Zero issues, zero crashes - brushes looked as I'd expect, smooth operation. I use my Wacom tablet connected via USB, I haven't tried my wireless option (yet).
I thought I'd report the update. Very happy now with my Wacom and Contour devices now.

Cheers!
I'll be updating my wiki entries.