Unable to import any sounds to Flash CC on my Mac -> OSX!!!

Hi,

I switched from Flash CS6 to Flash CC. I´m working on a project with some sounds on a Mac with OSX 10.7.5!!

Using Flash CC I am no longer able to update old sounds or to import new Sounds - no matter what format they have. I can´t update, drag´n´drop or import any sounds - I just get these error messages:

I tried .mp3, .wav, .m4a - noting works.

When I open the same Project in Flash CS6 I can update and import all sounds / each format - no problems at all. Using Flash CC I have no change to get my sounds updated or imported into my Project.

Thanks for help

Best regards

Jan