In the July 2026 version of InstaMAT, there seem to be 2 bugs with brush dynamics (when used via Mesh Painting node in canvas):
1: When I try to switch from Quadratic to Linear, it doesn’t save, and when I click it again, it shows Quadratic again. Setting it to Custom seems to persist.
2: If the drawing tablet is connected AFTER InstaMAT is launched, upon clicking the little button, the little box menu to configure dynamics settings does not open at all.