I was able to solve the problem by installing Premiere Pro CC on my machine. This converted the file upon opening it and in the conversion or through the new softwarey problem had resolved itself. So long as I work in CC from now on.
It happens same to me in Premiere CC
In short after reading LOTS of people complaining like you have, like I have like probably about 1 million people who own AVCHD cameras have that the most used format to shoot on for home /semi pro users is AVCHD and Premiere... get ready for this... take a deep breath.... DOESNT SUPPORT ITS AUDIO FILES. Its apparently licensed by DOLBY and you ahve to contact and minktonka company and pay.... really sit down first... take another deep breath... they want $300 for the plugin to make it work.
So Adobe have shafted.... is that a polite enough word... its customers who just want to play their files - not even encode the project to dolby digital - just play and edit their stuff. No even though you own that camera which only lets you shoot in that format and even though you are stuck wanting Premiere, adobe thinks that for the large monthly sum the world can go sit on its finger before they will sort this out.
Adobe are you listening..... hello Adobe... have you gone mad Adobe... hello. Earth calling Adobe.
As someone pointed out you can play these files on quicktime, media player... so seems apple and microsoft PAY THEIR LICENCES ON BEHALF OF THE USERS OF THEIR PRODUCTS. Adobe must either be skinflints or maybe a nephew of theirs owns Minkytonkatoy firm who are selling that annoying plugin. Ever heard of download sites... cough cough.