Broken Lock Screen iPod Controls

I searched the forums but wasn't able to find any mention of my problem, so I thought I'd just go ahead and ask about it.

I've noticed since my update to iOS 7 that the iPod controls don't work at all from the lock screen. Even though they appear as usual when I swipe up to access Control Center or when I double-click the home button, tapping on the controls doesn't do anything. Additionally, they only rarely respond when I access Control Center from an app. However, both the controls inside the Music app and the ones in Control Center when accessed from the home screen seem to work quite reliably.

Has anyone else had an issue like this?