I looked on Gamefaqs, said the barrel would be there, but it wasn't.  Had to end the game, must have been a bug.  I had leveled up too :(

I don't remember having any problem like this in the temple, but though I remember the barrel bits, I don't remember the exact point you're at.

Try again, and if it does it a second time, check for another path out, then restart and don't get the money. Easy.

:^S