so, today i must reinstall to oldest version. We have a lot of work with mts files, but can't work in cs6. Woow i am very sad this problem. Please tell us when you fix this. For me it is very important, because i must know, when i buy all updates to other plugins.
FIXED Yipeeee!
It isn't all good news though but I do have a solution that will almost certainly work for you, all be it a bit Drastic
This problem has been killing me. I just want to be able to drag and drop the MCS file into premiere pro like I always have with other video files and all the nonsense about pulling over entire folder structure just WON'T DO 
, we are not living in the 70's. And thank god the file structure thing is just stuff and nonsense.
What is happening is this.. something on your PC is stopping the files working (and Adobe haven't a clue what it is) and for that matter nor do I 
but until someone finds out, I can report that a complete blow away and reload of new windows will 100% solve the issue.
Now I haven't done one for years, so it was a complete pain and took me over a Day to get every thing back the way I like it and to be honest it will be a week before I have all my favorite programs working properly. BUT I can report that with Premiere Pro installed I can now just PULL THE FILES OF THE CAMERA HARD DISK and DROP THEM ANY WHERE I LIKE and better still, pull them into Premiere any damn way I like and they play "Sound and All" And that my friends is the way it should be 
I really hope this helps some of you, I am stoked 
that it now works and I can get some work done, I was starting to hate my new camera but now I can report it is A1
To Adobe I can report that some system setting from another installed program is clearly the culprit but I can't for the life of me tell you which. I can say that it is not mine or the programs fault but a lack of thorough testing on Adobe part. Because clearly this is not and un common issue on your forum and many others. Software should work under any scenario, I certainly don't run any strange programs that should cause this.
Until Adobe can pin point a solution and patch their program, I can recommend my solution buy Guys and Girls be careful back up all your mail, favorites, passwords, documents and everything else precious to you before doing a clean install and if you do you will get back in the groove with our favorite editor PP CS6.
TTFN
I gotta get some work done
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