having this issue as well. Imported a simple obj from maya to sculpt. It's there when filling out the initial menu with subdivisions and such. it's there when l press enter and it's there after. Just when l click a brush. bam. all gone
I'm revisiting 3dcoat and the latest update to 4.8.10 has given me a weird bug. The mark seams tool does what it wants. I cannot use it on the edges l'm hovering over with the mouse, it'll always maybe select an edge loop around 4 faces below where l'm selecting. It also wont select individual seams and instead stay in edgeloop mode. Please help.