The text message alert stopped working on my Panasonic KX-TG78xx home phone system after I upgraded to KitKat 4.4. When I look at the Bluetooth settings for that device, sometimes MAP shows and is checked, but usually MAP doesn't even show up - just the 'Connected to Phone Audio.' But, even when the MAP shows as connected, the text alert still doesn't work on the Panasonic KX-TG78. Even if I install the workaround app - 'Text Message Alert' -from Panasonic the Panasonic phone still doesn't alert. The phone audio feature thru the Panasonic still works fine, though.
I know the Panasonic phone text alert feature works ok, because my girlfriend's iPhone 5 still text message alerts on the Panasonic.
Also, on my car, phone audio, music over Bluetooth, and text messages displaying on the Nav screen all work ok.