We recently encountered our driver's seat stuck in the fully rearward position. When attempting to move when we pulled up on the handle the seat would come forward less than 1/2 an inch. The locking pins were engaging on both sides and would correctly lock the seat into position. After a couple of attempts to determine the cause, I was finally able to identify the culprit. It was a nickel that was lodged in the outboard track at the very back of the seat track. It was just sitting there in a slot in the track and whenever you attempted to move the seat it ran up onto the nickel and stopped it cold. To fix it, I was able to push the nickel up with a very small screwdriver and then move the seat forward where I could fish out the nickel out with a couple of small screwdrivers. Lift up on the nickel and get the bottom to move out of the track and it will fall out onto the floor. Hope I can save someone some time and energy or maybe some service $. Could have been an expensive nickel.
Not the first time I have heard of this happening. I have used duct tape, chewing gum, and other sticky substances to try to remove items from the tacks. As long as the coin is not bent or lodged in tightly, you can get it out. Worst case the seat has to come out.