Greg, looks like you don't have the steel rollers. I had the polymer rollers originally and they constantly stuck. When I replaced my traveller with the steel rollers, I also sanded out the nicks in the track with crocus cloth and have not had a problem since. There should also be flat head slotted screws on the inside of the beam allowing the traveller to freely pass over. I saved my old traveler with the intention of drilling out the posts and mounting new steel rollers to use as a backup, but I haven't gotten around to it yet.