I did some googling but I couldn't find the exact problem. After I updated to CC 2017, but before I updated the Cintiq driver, the cursor went nuts. It couldn't even be controlled with the mouse. Now there's just this annoying problem. My graphics card, which WAS a GeForce GTX 780, died right after the warranty expired (it was purchased refurbished). Figures. But that was some time last year so I've been running with the on board Intel HD graphics without any Photoshop problems until now. Maybe sometime after Christmas I can get another graphics card but I kinda doubt that will be possible.
I did read that the brush spacing might affect it but that fix didn't help. I also read about the pc confusing the mouse and the pen input, but that's not a fix because I don't want to turn off my mouse. I still use it. I didn't have any theme on my cursor, it was set on NONE, but I did change it to Windows system default. We'll see if that does anything.