AA only works on newly created objects for me. If I try to modify an existing one I receive the error shown below in the attachment. If I click okay a "processing rules" windows comes up but never finishes. I have to close ArcMap and start over.
I am using the Canadian Municipal model if that makes any difference.
The Canadian model just doesn't want to play with AA and is no longer supported by ESRI. I'm converting my Canadian Data Model over to the US model, so far so good. Attribute Assistant's a great product.
Some new information on this, I had the same problem with the US model after adding some of my survey data. For some reason AA doesn't like my survey points that I've added using "add xy data". Once the data is removed AA works fine.