Most likely just like the other 'features' that got turned off with the update to 4.4.4
For me, it was 'no sound alert' for an incoming SMS message.
Chirps was still enabled, and notifications still on. A restart did not fix it, initially.
So, I decided to just uncheck everything and then recheck it the way I wanted it.
Did a restart and that fixed it for me.
I suspect yours is much the same.
Or, you could just click reset phone to Defaults.... but that was too drastic for me.