Prior to 4R2b, I was able to use curve mode on models with multiple subdivisions, but now whenever I try it, I get a message saying “the mesh is composed of multiple subdivision levels. Action cancelled.” Has that been changed, and if so, why?? I really liked being able to use the MoveCurve brush on high resolution models. 
Same by me with Zbrush 4R2b. I can’t use the Stroke curve mode on a model with subdivisions or layers.
When trying to draw a curve I get the error messages " The mesh is composed of multiple sudbdivision levels. Action cancelled." or " The mesh has layers. Action cancelled."
bump same here
BUMP, this has been frustrating me lately. Does anyone have any good workarounds?
hey i am geting the same problem here as well