Comment 4 for bug 1266645

You are using the trunk ppa, right? You are lucky it works for you at all.

A major feature has just landed to trunk, changing the way relationships work. I can't confirm this behaviour, even I haven't even seen the new membership management interface.

I suggest you switch to ppa:schooltool-owners/dev, downgrade schooltool and python-schooltool, and restore one of the backups before this upgrade. See http://book.schooltool.org/install-2_0.html and http://book.schooltool.org/database.html

Unless you are willing to help us test the code we are actively working on.