Views: Adding Nat: Nid argument results in "Error: handler for nat > nid doesn't exist!"

Adding Nat: Nid as an argument results in an error message of "Error: handler for nat > nid doesn't exist!". I'm going to see if it's possible to fix this.

Another thing is that the Nat: Tid argument has been removed from HEAD since BETA 3. Is that going to be removed?