I found the answer. CL tech support got back to me with this fix and it works. This is an issue that seems to appear when updating to SR3 while operating with multiple runtime directories. The solution would be to delete the "WalkDesigner" (found in Pose dir) directory from any runtimes other than the main Poser runtime. Also, search your Poser directory for any " *.pwd " files and delete any you find. These are walk designer cache files which can occasionally become corrupted. A new one will be created the next time you run the walk designer.