OK, I tested all the conditions on my personal laptop with the following results.
Ubuntu repo version:
No session crashes, e-mail test worked fine. Attempts to e-mail books did absolutely nothing.
Binary install from official site:
Everything works fine! I also noticed that there are some newer features the repo version has not caught up to, and that it does not use the default Ubuntu font (a good thing, in this case; I suppose that's configurable, but I can't usually be bothered).
I had the same results in both Unity and Gnome 2. I'm assuming that either the session crash bug in Unity has been fixed, or will rear its head at a later time (perhaps after running Calibre longer).
Thanks again for the info and suggestions, and for replying so quickly! I hope the details here help others in the future.
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