So for information, that's what I did. The problem is in that case I lost all my workspace. I have it saved, so I could reload it, but the problem came back with it. I ended up deleting a specific brush that was at the origin of the bug apparently, but I couldn't find more.

I was fiddling with custom brushes when I clicked on "dual brush". This made Paintstorm crash immediately. Then any further attempt at starting it up again leads to another immediate crash on launch. Here is the first log report: WinProc: onMouseLeftDown _INTERFACE::sendMessage msg=513 1 2 3 _wnd::g...