I am experiencing exactly the same symptoms (Karmic Beta), I think this bug is closely related to https://bugs.launchpad.net/evolution/+bug/393534, the attachments view seems to be triggering that behaviour.
I am experiencing exactly the same symptoms (Karmic Beta), I think this bug is closely related to https:/ /bugs.launchpad .net/evolution/ +bug/393534, the attachments view seems to be triggering that behaviour.