Distribution Lists do not expand

[Crystal]

When trying to expand a distribution list by hitting the + button, I
received a message box indicating that the command requested is not
valid for this recipient (ME)

 

[Russ Valentine [MVP-Outlook]]

Some information would be nice, since none of us reads minds. Outlook
version, information store, and view would be a minimum. Feel free to post
anything else you think might help us understand your problem, like the
precise steps that produce the error message.