After answering the puzzle questions from Azmodeus I cannot continue, I always get the response "Why not try putting it in your pocket". Even cleaning out the Dynamic Cache for Act 3 doesn't help. Running GOG Version 1.47 (Latest) on Win7 64 Bit system.

Click on the gold boulder.

Thanks, I was clicking on the Large Boulder it only worked when i clicked on the smallest one.

I thought it worked with any of them, or I would have been more specific. I must have just tried the smallest one first.