I have artrage 6 and have just got a Gaomon (PD2200) tablet to replace my old wacom intuos and I am having all sort of weird issues with the program now: random straight lines appear across the page when I try to change a layer's opacity or visibility, some brushes don't seem to work properly, I find it hard to change use the menu of costum brushes because the pen doesn't seem to "hold" the menu.

Is it an incompatibility with Gaomon? (I am also a Mac user, if it makes a difference)