Hello Martin,
Thank you for your message.
I had entries in the Viewer sorted by Connection name in ascending (alphabetical) order prior to upgrading to version 6.7.0.2. Now when opening the Viewer, all Online connections under the General address book are in some random order. Offline/Unknown connections are still in alphabetical order by Connection name. If I click on a Folder and back to the General address book, they return to alphabetical order.
Do you have
Use group view enabled on the View tab in Options? That helps you first group (online, offline etc.) and then sort within groups.

Now the additional problem. If I connect to a system that is Online, it moves to Logged on group. When I log off, it goes to the end of the list of Online connections. It no longer goes back to it's place in alphabetic order. Connect and Logoff, it's at the end of the list.
That's for pointing at this issue. We'll see if we can fix it.