Operating system: Windows 10
Graphics card: AMD Radeon r7 m460
Broken: (example: 2.91.2, edbf15d3c044, master, 2018-11-28, as found on the splash screen)
Worked: (I don't know)
Short description of error
vertex paint draw and another file not work brush not, but when I used in a new file then it works for few strokes
Exact steps for others to reproduce the error
Based on the default startup or an attached .blend file (as simple as possible).