Thanks for the prompt, definitive response

That really sucks. Do you know what the rationale is for that rule

This is a bummer because I'm required to protect the project with a password, but I have been relying on the .CodeName property of the sheets in various places (I create a kind of custom sheet property with a prefix in the .CodeName). I suppose I could come up with another mechanism for storing that custom sheet property, like a name. And then let the .CodeName be however it defaults. It's still a bummer that I can't control the .CodeName, I like to have everything neat and organized. Oh well

Thanks again

James