So in HoD, I have a few puzzles where there will be damage combos or warp combos, etc. in the screen, and you need to push a block over those combos in order to get across. However the bug happens when you push the block up. You will be leaning against the block pushing it, and somehow you can touch the tile that you are pushing the block on top of (which is kinda against the point).
So for example, in my level 3, you push the block on top of the lava to cross it, however, you will get damaged because you are leaning against the block while it is covering that tile. But again, it only happens when you push it up.
Edit: Oops... I see this bug has been made in a thread already. Sorry, I didn't see it:
http://armageddongames.net/showthread.php?46329-Beta-18-Pusing-blocks-onto-damage-combos
But it is confirmed. lol