Went out sailing yesterday, and some fellow sailors with catamaran experience helped me rig the mainsheet correctly for the first time!

The downside is, the mainsheet traveller on the aft beam (not the one on the mainsheet) got stuck on the track. The sail ended up pulling the traveller off the track(!!!) and I had to attach the mainsheet rigging lines to the center of the beam for the rest of the jaunt.

What could cause this? I noticed 2 things:
1) the traveller track has a few dents in it. Nothing very major - not enough to derail the car.
2) the traveller car didn't seem to have nearly enough ball bearings. It could be I lost some of them when the car came loose.

The car looks to be intact. Should I just get some new ball bearings and smooth out the track with some steel wool and WD-40, then re-attach the car?

-Aaron