I have a Huion Inspiroy H640P tablet and pen and I am having the following problem.
When I try and use this in the Affinity Photo for Windows 10 I can see the pen move, I can select a menu item, move layers etc.
However, when I try and use the brush option it will not paint. I can see the brush move, change size, hardness etc. But it will not put down any colour.
I have tested that I am on the correct layer and not using the undo brush, by trying the pen, then put down the pen and without making any other changes I then use the mouse/trackpad, and they work fine.
I pick up the pen and without any changes try again and I can see the movement of the brush head, but nothing.
I have also tested it using the Windows doodle/paint/memo option and all work.
Affinity Photo version: 188.8.131.52
Hulion driver version: 14.7.6
Windows 10 Home version 1803
OS build: 17134.286
Laptop: Lenovo ideapad 305
Intel i3 Processor.
So I have the most up to date version of driver and software, Windows is patched up to date.