help with tomb raider anniversary

hey

im in the leval TOMB OF TIHOCAN when i have to move 2 wooden crates into square pressure pads one opens the gate and the other one opens platform with the metal ring , now when i moved one of the cartes it opens the gate and when i move the other one to the square pressure its should open or relase the platform but its not :-( the game stuck ! and i have to reload it .

what im doing not good ? i follow the walkthrough like its say and game stuk ...

can u help me out ?

Its a bug, I got it once...

I heard there is a hack where you can make Lara fly, it's somewhere on http://www.tombraiderchronicles.com (in their forum)

The puzzle objective is to release the platform, rise the water level and with the platform jump into the room on the far end of the place.... Since you can't do that, try to use this hack to just fly to this room...