NPC's not ragdolling correctly

I have a problem on my server where whenever I kill a ragdoll no one is able to move it with the physgun, I have enabled Keep Corpses both through rcon and the little checkbox, does anyone know how to fix this? Prop protection is not interfering because I have run the server with no addons, anyone know what command I should add to the server.cfg? Also when someone ragdolls another person they are unable to move them. Any help would be appreciated.