i've had that happen a couple times, but it's easy to fix, and doesn't pose a huge threat to getting stuck in the chain. i usually use an old strap for the fronts, because it already has a shape to it. when i get a new pair of straps for the "normal" position, i just rotate the old ones up to the front and cinch 'em down. it's a nice setup because there ends up being less pressure on the one strap, and i don't worry about snapping a strap, or my clips as much anymore.

it also depends on how wide your shoes are, i guess.