Version:           KMail 1.9.6 (enterprise 0.20070907.709405 (using KDE 3.5.8)
Installed from:    Ubuntu Packages
OS:                Linux

I updated from Ubuntu 7.04 to 7.10 today.
Now the following bug appears:

Open "New Message"

Typing aLetter shows all the known email addresses starting with aLetter in the recpient line dropdown list.

Moving the highlighted line down through the dropdown list adds the highlightened address to the recipient line.

Going furhter down leaves the "real name" of the previously highlightened address without the suiting email address and appends the next entry, etc.

Example: 

Note: In the example ==> marks the highlightened line

Step 1: Type aLetter
To:     A
_______________________________________________
==>    "Aaron Speedman" <Aaron.Speedman@email.com>
       "Abby Tabby" <abby.tabby@email.com>
       "Achmed Salomon" <achmed.salomon@email.com>
 
Step 2: Move highlight down with down arrow

To:    "Abby Tabby" <abby.tabby@email.com>
________________________________________________
       "Aaron Speedman" <Aaron.Speedman@email.com>
==>    "Abby Tabby" <abby.tabby@email.com>
       "Achmed Salomon" <achmed.salomon@email.com>
       "Axel Axeman" <axel.axeman@mail.com>

Step 2: Move highlight down again with down arrow

To:    "Tabby, "Achmed Salomon" <achmed.salomon@email.com>
________________________________________________
       "Aaron Speedman" <Aaron.Speedman@email.com>
       "Abby Tabby" <abby.tabby@email.com>
==>    "Achmed Salomon" <achmed.salomon@email.com>
       "Axel Axeman" <axel.axeman@mail.com>

Step 3: Move highlight down again with down arrow
To:    "Tabby, "Achmed, "Axel Axeman" <axel.axeman@mail.com>
________________________________________________
       "Aaron Speedman" <Aaron.Speedman@email.com>
       "Abby Tabby" <abby.tabby@email.com>
       "Achmed Salomon" <achmed.salomon@email.com>
==>    "Axel Axeman" <axel.axeman@mail.com>

etc.

Moving the highlight up again would add the fragment of the last highlighted entry in the similar way.

Nevertheless: Good work boys! I like KMail!