A Possible glitch in classic Zelda on virtual console?

I bought the original Legend of Zelda on Wii virtual console and I'm currently stuck in Level 7 due to a block that won't move!

I know that I'm supposed to push the center-right block in the "tip of the nose" to open a passageway which leads to the boss Aquamentus...however, the block won't budge!! I've tried every block in the room and yes, I have attempted to push BOTH sides of each block in the room.

Has anyone else had the same experience?

you have to kill all the wallmasters first.