I have been using a Wacom tablet successfully, but bought a Huion 610 Pro yesterday.

If I draw with the trackpad or my Wacom tablet, all is well.

If I draw with the Huion, although the pointer moves and the undo/redo shows a freehand stroke (or whatever) nothing appears on the canvas. (And if I subsequently draw with the trackpad, nothing appears until leave the drawing area and then return - either to select a new colour or off to a different application window.)

Curiously, if I draw in the brush settings editor's preview area I see the brush working, complete with pressure behaviour, so the Huion's pressure information's making it through to that part of Krita. (MyPaint also sees the pressure information; GIMP doesn't.)

I've just noticed that if I select a colour with the Huion, then try to draw, that colour is added to the column of recent colours to the side of the Advanced Colour Selector when the stylus touches the tablet, so I'm guessing it's resetting the colour at that point - perhaps to transparent? It's not drawing with the background colour, but it's only the colours I choose as colours which are added to that 'recent colours'  

Oh, and the fill tool works. So does 'select similar colours', although it only selects transparent.

Reproducible: Always

Steps to Reproduce:
1. Plug in a Huion 610 pro
2. Draw with a brush
3. See the effect on undo/redo

Actual Results:  
Nothing appears, the 'recent colours' list might be updated if I've tried to choose a colour.

Expected Results:  
Drawing!