Did you change any of the variables/properties about?

I'm having a weird problem. I've just made a map in the DKII editor, but for some reason imps can't dig through anything, it's like it's treating every block like a gem block with no gold. Please help?
Did you change any of the variables/properties about?
"In this eerie world so bold and true, I stand atop the hill to get away from you.
Transparent in indulgences and bewildered by trust, I'd happily assume that killing you is a must."
No, I've fixed it, it seems for some reason it automatically changed all the global variables for the level to zero.

