I'm using Telepathy with a Google account. When I try to delete a group, it doesn't. Reproducible: Always I'm presenting this issue just after https://bugs.kde.org/show_bug.cgi?id=329901
I noted that if I kill telepathy process and restart the app, the changes are applied right.
I can't reproduce this on git master. We have changed the way groups in a contact data is stored between 0.7 and master, so this is almost certainly the reason for the fix.