We changed a google group name from "Old Name" to "New Name", but only new recipients in Gmail for Google Apps see "New Name" when composing an email to the group, or receiving an email from the group. Everybody who has already communicated through the group still sees "Old Name."

This seems like a failure to refresh problem in Gmail. Is there some way to force refresh the group name? It is particularly bad because "Old Name" is ambiguous when Google chooses to display only the first name portion of the name.