Version:            (using KDE KDE 3.5.1)
Installed from:    SuSE RPMs
OS:                Linux

I open a new mail window in Kmail and type in my message.  Then I use the "select" button right of the "To:" field to select a contact I want to mail to.   This works fine.  I sometimes haven't yet added the contact I want to my Addressbook so, while my "compose mail" window is still open I go back to the main "kmail" window and find an email from this old contact.  Then I right click on their email address and add them to my address book.  When I go back to my "compose mail" window and click on "select" all the addresses in my contact list seem to be duplicated.  I can still pick a contact and use them so this is a very minor bug.  If I send the email and open a new "compose mail" window and click on "select" the address book has returned to normal.  

I'm using an IMAP account for my mail but the address book is just a local vcard address book.

Please feel free to contact me with questions if you need more details.