I used Topobuild to retopologize a highpoly model made in ZBrush. Later I made some changes to the highpoly, re-imported it, and re-activated the Topobuild node to try making some minor tweaks to the topology to accommodate the changes I made.
The problem I'm having now is that this does not allow me to actually make any changes. With Topobuild activated, for some reason I can't move any points, I can't remove anything, I can't add anything. The node seems to activate fine and I can still make selections and such, but trying to make any kind of actual change has no effect.
I even tried creating a new Topobuild node after the first one, and it's doing the same thing. It's like the topology is locked.
Does anyone know what would cause this?