I've finished upgrading the site. There are a few issues:

1) The upgrade wiped out any forum signature you may have set up. You'll have to reenter it (User menu > My Profile > Update Your Profile (link on page) > Forum Settings tab

2) Deleting forum subscriptions and forum favorites in your profile is a bit wonky right now. I think you can delete them individually, but doing it all at once isn't working. Also, you'll notice some strange text. There is no fix available for this yet.

3) Quotation marks have been replaced with some code in old posts. I'm fixing these as I see them (hence you may see that I've edited one of your posts). This doesn't affect new posts.

If you notice any other issues, let me know.