Audio set to [AC3], but no sound ...

#1
Why do I have to change audio settings for (nearly) every channel from "language [AC3]" to "language" manually to get sound? ("language" stands for any language like, english, french, german etc.) Why is that setting on [AC3] by default (giving no sound)? changing to non-AC3 brings sound back.

Re: Audio set to [AC3], but no sound ...

#3
Hmm ... I don't want to disturb you: with many channels I have several languages, among them "English", "German" AND "German [AC3]; default setting is to "German [AC3] – and I don't hear anything. I have to set manually to "German", then I have sound. I wonder that the default setting is "German [AC3]" and not just "German".