Although what has been said above regarding geometry RSR files is correct it does not apply to Poser Pro Pack. The Pro Pack does not use geometry RSR files, it reads the OBJ direct.

Double check your OBJ file, open it in UVMapper and check the group names. If you have been editing it there exists the possibility that the group names have changed. For example one of the export option out of Poser will add "Figure1_" to all groups. Other modeling applications make similar alterations. The names must match what is in the CR2.