Version: 4.4.1 (using 4.4.1 (KDE 4.4.1), Gentoo) Compiler: x86_64-pc-linux-gnu-gcc OS: Linux (x86_64) release 2.6.31-gentoo-r6fz I have converted mine standard adressbook into an Akonadi addressbook. Besides, all mail distributor lists have got lost (they were empty). No problem, I created a new mail distributor list. I saved it and for a short time i saw the entries in the address column then they disappeared and the group entry was empty.
Make sure you use the 'Personal Contacts' address book for storing the contact groups. The 'Address Book (traditional)' or 'VCard address book' can't handle contact groups.
You can remove this bug. I used a standart kde addressbook. Sorry for the mistake.