Xbox360 glitch - stopping me from playing

[trashy]

Hello,
I bought the Xbox live arcade Guardian of light, and we have been happily playing it co-op until we get to level 2 (temple grounds). When we cross the collapsing bridge and the stone hands block the doors to the sun piece, there is no way to open it. We read the walkthroughs etc, and it's not a fundamentally difficult puzzle. The pressure switch on the LEFT (bottom) is already depressed by a "block" that is only textured on one side. A bomb will get rid of it, but stepping on the plate does nothing. We have tried doing them simultaneously, seperately, in every possible order, it doesn't open. It works just great in single player though. Any assistance is appreciated.