Brush Glitch on iPad Pro

[EnsomMemory]

So here's the problem. When I use the Classic SAI Water brush, it works fine but if I draw on an alpha locked layer or on a clipping mask layer, it just makes this ugly glitchy looking deleted area until you hide the layer then unhide it, showing what you actually drew. Hopefully it's a quick and easy fix for you guys, since Classic SAI Water brush is my favorite brush lol Thanks for this amazing program and all your hard work

[support]

Tested... and for me it's ok. Does the GPU enable?

[Blendie]

SAI brush too is my absolute favourite, and I have the same issue: works perfectly until use alpha on the layer. (SAI works fine if freehand select an area and paint within that). Ipad pro 10.5, latest iOS update. Not sure about GPU side ... have multi-cores option selected, if that's what enables it. I just tested again, and the issue didn't happen when I selected e.g. a charcoal brush but, when using the SAI brush, it erased what was there.