Help "Who" has shortname instead of Fullname

I upgraded my server from r5 to r8, clients are still on r5

I know thi sis teh r6 & 7 forum but the r8 guys didn’t answer, besides this form seems to get more answers

Mail templates have not been upgraded yet

It seems that when ever a user sends mail to another user in Notes the “Who” field in the inbox displays the shortname instead of FirstName LastName.

Has this changed in r8 ??

More importantly can I change it back to display common name (FirstName LastName) ?