Hi dhulse, this problem can occur when the new Walk Designer improvements conflict with old Walk Designer poses. Can you let me know the date of the Walk Designer poses in Runtime/libraries/Pose/WalkDesigner? They must be updated, if this worked, then they're dated from March 24th. If they have been updated, then let's try another thing: please search all your runtimes for the WalkDesigner folder. If you happen to find one or more asides from the updated one mentioned above, please move them out of Poser's reach (or delete them, if you can do that). Also make sure to delete the file 'Don for Walk Designer.pwd' in Runtime/libraries/Pose/WalkDesigner. It caches walk designer data for speeding up its start (btw, this is the reason that starting the Walk Designer for the first time takes so long, because that file has to be generated first). Now lauch the Walk Designer again, and see if it works. If it works, and a new .pwd has been generated successfully, you should be able to copy the removed folders back to their location, if you need them.