My rear-center buckle (the part attached to the seat) broke.
It appears that the rear belt buckles fold down even with the seat when the seat is lowered, and this one failed to raise enough to clear the edge of the seat as it was raised. The edge of the seat caught the buckle, pushed the cover down off the buckle and snapped the red plastic button mechanism into several pieces. I can tell where it caught on the seat because there's a small fuzzy piece where the fabric was pulled.
Has anybody else had a problem with this?