Restoring broken item

[Adrianis]

Damn ok, I'll test this out when I get home later on, I've got debugging so should be able to tell whats going on with the names.

In the meantime, could you post the full code?

Also,

Destroying the first potash ("potash_1") causes a second one to pop up, but no more are created after that

Without knowing what you puzzle actually is, does the second potash activate the collide callback correctly?
(if its hard to tell, you can 'debug' it (old-school style) by including a light in your map to turn on in the callback, so you know whether that code is being executed)