I've been having this problem as well. No volume, nor volume change recognition in Videos, Music, Ipod, Pandora, FB, Instagram, Youtube, ect.. However, voice memos - yes, choosing ringtones while in settings - yes, even the Alarm plays the song it's set to. Cannot understand why it only works in certain places.
But wait! There's more!
I've been having battery issues and more than a handful of screen freeze issues since the last update. Yesterday was when the volume went away. I was walking listening to my ipod when it kept cutting out. I'd reopen Music, hit play, then it would disappear in 30 sec, give or take. Till it abruptly quit all-together. I tried powering down, and it wouldn't. It kept repowering itself back up. Even with a hard (home key and upper key held) shut down. Finally I forced the battery to die so it would shut down. No longer having issues with the powering down/back up... thankfully.
Here's what else I've tried.. The memo trick. Cleaning the dock. Cleaning the 3 tiny mesh screens. Cleaning the Headphone Jack (it was plugged in when the issue started.) I've also, tried restoring back to factory settings.
I don't have the money to replace the dock port (assuming that would cost anything.. though I have no idea how one would go about doing that.
Can anyone help me pretty, pretty please?