I guess I have had the same problem, just a terminology difference. When I went to disconnect my trailer from the truck it would not come loose. I took a 7 foot steel rod that was real narrow on one end. I pried it between the bumper and the receiver and finally got it to pop loose. This is the 3rd receiver to do this to me in 2 years. They wont go back on the ball either. At least 2 of them didnt. I had to replace them. The bottom line is when I remove my safety pin and slide my receiver latch it will not move the lip that locks onto the ball. The latch moves freely, maybe to freely but it doesnt work anything inside the receiver. I took both receivers apart and all the pieces were intact. Why does yhis keep happening to me? Im at my wits end here and need advise. I am tired of having to cut receivers of with a cutting torch and welding on new ones. Any help is greatly appreciated. Thanks Sorry but i started a new thread, please forgive me!