Hi Nicholas,
I would have thought the ``syncdb --migrate`` would have ensured your DB was in sync with the later version.
That being said, I haven't tried that specific upgrade path between those two versions. I'll try to find time to test that later today. The loading of "available" and "included" are done through javascript. So you could see whatever error it is hitting in the FireBug console.
If you want help troubleshooting this interactively, feel free to ping me on
irc.mozilla.org in the #moztrap channel. I'm "camd".
-Cam