No longer receiving Facebook notifications

Today must be the third time I've been gouged to not lose my Play Every Day bonus. I check my Facebook notifications every day, and I USED to get "So-and-so has challenged you in Playlist, It's your turn!" (or however it was worded). But I haven't received those notifications in a few weeks now, meaning I have to manually enter SongPop just to see if I can play any! I really don't appreciate having to pay to keep my progress when all it would take is the notifications I should be getting.

And I've checked my Facebook privacy settings, SongPop is still authorized to send me notifications.

Note: For Topic, below, there's only Artist/Playlist Suggestions, Feature Requests, General Discussion, and Lost Contact With An Opponent. None of these apply, which is why I'm writing my own post. This is a Bug, this is Something Isn't Working. This is the only applicable place I've found. But since it won't let me leave it blank (the actual correct answer here), I figure Feature Requests is the most applicable: I request the feature of sending Facebook Notifications be returned!