Manjaro 0.8.10 Update pack 4 now online, update as usual with either octopi or from the terminal: sudo pacman -Syu
Update Notes: Octopi 0.4.1 released, Kernel 3.4 officially dropped for good, updated Nvidia proprietary drivers, better steam integration via the steam-native package, many bug/security fixes as well as the usual updates.
Yes this is a known issue, It seems there is a compatibility issue between versions of the DB.
Deleting ~.local/share/akonadi in your home folder should fix the problem, it will take a few seconds to rebuild though…