I was able to restore my site from the 500 error and I installed the latest update. However, when I attempt to tag a user, it doesn't work (it's plain text, not a link). Old posts on the Newsfeed still work as intended.
I also added the Autocomplete plugin and it doesn't appear to work as intended. Instead of selecting the username, it incorrectly selects the Display Name and results in no link with the tag.