Us too! Bizarre coincidence.

Last night my stoker let out a squeal as I heard a snapping and clatter noise from the rear section. Turned out we had a twig flip up into the rear belt/ring area, and it stuck in the ring teeth for a couple revolutions, whipping around and hitting my stoker's left leg twice. The twig shredded and was gone before I was informed of what just happened. No apparent damage to bike, belt or stoker. No real difference than an occurance we previously had with a regular chain and timing ring.