UPDATE: Issue solved.
Hello;
I have an issue where the pixel brush tool is messed up and of no use. I have tried to repair it within the program, but no luck.
It has maintained across other projects, the last drawn shape and background colour from a failed attempt to create a signature brush.
I decided to re-install the program after removing it using the Windows app removal in Control Panel.
Unfortunately, there must be a hidden config file somewhere, because when I re-installed, the UI was as it was before, even showing recent files, and of course, the pixel tool brush is still messed up.
Can someone help me? Thank you.