Update (Version 1.3.0)
I've added a new feature. This is the first in a while, but hopefully more will come soon.
I was feeling particularly unproductive yesterday, so I told myself I'd add a feature to the forum so I could feel some sense of accomplishment.
The "Notifications" section of the forum header now works as a drop-down menu for quick access to Likes, Mentions, PMs, and Subscribed Threads.
Well, not exactly... The PM portion of it works perfectly. The rest are placeholders until I can get them working. This was a big step needed to get Likes and Mentions working again, so I'm happy to have made progress there.
Now, when you get a new PM, you'll not only get the e-mail notification, but you'll also see it right there in the header. Once you visit the inbox, the notifications count will adjust automatically (after you move to a new page, or refresh).
If you notice any issues with the feature, please let me know.
Sorry there isn't much to play with right now with the new feature until you get a PM, but that's how it goes. I plan to get Mentions and/or Likes working next. Those will be huge, and I know everyone misses them. Sit tight.
Edit: Whoops, I forgot to release the feature to everyone (I had it enabled for me only during testing). You should see the new behavior now.