I just realized I had about 5 month's worth of PMs that never reached me because of problems with the notifications. I promise I wasn't being rude and ignoring everyone, and I've written back to everyone just now.
If anyone else is having this problem, let me know by email and I'll look into it. You can check your PMs by clicking on the little letter icon next to your name on the top left by your profile picture.
"...Say, 'GOD is sufficient for me.' In Him the trusters shall trust." (Quran 39:38)