I've imported a less than optimal mesh from 3dsmax into zbrush to do a sculpt with the intention of doing some retopology to make a low poly version which I'd then unwrap and bake textures to. However when I added my zsphere to start editing the topology I found that after the first few points were laid down I couldn't add any more. The first few could be added normally then every left mouse click after that would rotate the camera slightly (slightly, not like a right mouse click) then deselect any selected vertexes.
I'm completely stumped on what to do, I did some successful topology editing just the other day, the only difference then was that my initial mesh was from some zspheres rather than an obj import.
Any ideas on what I've done to make the zspheres hate me?