That makes sense. Thanks for the reply, I thought I was going crazy trying to solve it, heh.
Having played through the rest of the levels now, I think "Shifty-Block-Stopper" may also be broken because the telekinesis power seems bugged while standing on ice (it moves things as far as possible instead of one tile at a time). Or maybe there's a way to work around that that I haven't discovered yet.
I really enjoyed the game overall, though!