So suddenly out of the blue, when I try to draw in Krita, or other software like this using my tablet, it is totally off. I've tried reinstalling the program and drivers, yada yada. Nothing. Still the same. I place the stylus in the middle of the tablet screen (when it actually registers on the canvas), the cursor appears a few inches to the right. I move the stylus to the left, the cursor slowly follows, not at the same speed. I move the stylus to the right, it catches up to where the cursor is, at the edge of the screen. I don't think it is the tablet's fault. When I minimize the program and am on the desktop, the stylus is perfectly tracing the cursor like it is supposed to. When I use MS Paint, it works perfect. When I use it in programs like Krita, it gets all clunky. Krita has literally no settings changed because I am on a fresh install of Krita Desktop. With the program window in the tablet screen itself, I can touch on all the tools and presets, but as soon as I try to touch the canvas, it either doesn't register or actually does work, but with no pressure sensitivity. When I check to make sure the pressure sensitivity works in the driver settings, all 2048 levels of pressure work fine. I'm trying not to pull my hair out but I'm coming close. Any suggestions?

Intel i5-4670K
8 Gb Ram
Nvidia GTX 670
Windows 10: System has all the latest and correct drivers. No hardware issues, etc.

Ugee-1200B Tablet. Still fairly new, haven't had it too long. Worked perfect just until recently. Callibrated and all. Latest and correct drivers. Pressure sensitivity fine.

I've had more reports of people having trouble with ugee and similar tablets and Windows 10, though. If it works in Paint, but not Krita or Photoshop or Gimp, then that's probably because a tablet first sends a tablet event, then a mouse event, Paint checks the mouse event, which doesn't have the precision parameters that Krita or other apps check.

You could install debugview and start krita; it might show the actual settings the tablet reports, and it could very well be off.

I looked at that debugview, don't know what's good or bad, but with Krita, when I try to start drawing on the canvas, sometimes it just doesn't register, and when it does, for a few seconds it will draw correctly, but with no pressure. Then I have to tap over on the tool area, outside the canvas, make the cursor appear there, then can repeat that process again. I tried it on paint tool, and it will start where I touch the stylus, then when I move the stylus the cursor doesn't catch up. It's not lag, it just straight up follows a rough parallel path an inch or two away from where I'm drawing.

So after a few days of frustration and reinstalling, I discovered that nothing was wrong with my hardware. Not Krita's fault, not driver faults (well, maybe). The solution was to disconnect a display and mirror the other one with the tablet display.

For the record, I have a wacky monitor setup. A monitor, a TV (lower resolution than the monitor but larger screen size), and the tablet monitor for the third. By disconnecting the monitor and making the TV and tablet monitor duplicate displays, the tablet becomes the main monitor, the TV is displaying the same as the tablet, and now the tablet's pen input works normally again!

My graphics card does support three monitors, but they are all three different types of displays and different resolutions, so the thing is probably as confused as I was when I first discovered this problem.