Sorry to hijack, but a friend of mine at about 1800ft ran into a similar issue only when he hit a drift and came down after wot, his secondary got wedged open by the belt getting stuck deep in the bottom and then of course you can't move. Pull the belt out of the bottom, the secondary snaps back...
I just took some time and really made sure the slots on the bottom of the cans is clear of any extra plastic bits from the manufacturing. They also tell you to put pledge or something similar on the rails to get things moving the first few times. Also if you don't mount the rails the way you are...