With all the mechanical failures (real and virtual) around here so far this year, it stands to reason that my Wacom would start acting weird. It was "skipping"-- in the middle of a stroke, its data stream would contain bursts of near-zero pressure readings. Not very pleasant for drawing.
Pulled and plugged its connections a few times, to try to ensure good electrical contact, and loaded a more recent driver. It seems to be behaving properly now-- here's what developed out of my test scribble in Photoshop. A bit "artsy," but what the hey.
I'm getting REAL tired of perpetually having new breakages to fix...