I recently updated my version of the prp plugin, and, after working through all the immediate problems with the new regions, things work properly again. But this version seems to have introduced some problems that I can't fix.
first, all my vertex colors are massively desaturated when viewed in uru, and second, the exporter totally ignores any changes I make to the normals in blender, so objects which I have had to invert the normals to display properly still have inverted faces in uru.
here is a picture showing the desaturated colors problem. note that this makes the avatar seem washed out by comparison. Also, deleting faces from a mesh in blender removes the graphic object in uru, but the collsion remains. To fix that, I have to modify the vertexes surrounding the face. (i.e. delete them and make new ones, replacing the surrounding faces in the process.)
(it's been several versions since I last updated, so I don't know how long these problems might have existed)