Created attachment 105003 [details] Video demo of the bug When you use the multibrush tool with a shape brush preset, when the strokes overlap, strokes and shapes randomly appear and flicker on the canvas. I'd expect the shapes to layer on top of one another in such a case. It'd be a super powerful tool for pattern creation.
Hm... Yes... But that's pretty nearly impossible, as far as I can tell.
I'm sorry Nathan, but this just can't be fixed with the shape brush engine.
No worries :)