Found the probably related bugreport:
https://bugs.chromium.org/p/chromium/issues/detail?id=623290
so now installed Google Chrome with the by Google themselves provided dpkg-file from their Google Chrome Website (which is Version 53.0.2785.92 (64-bit)), the chromecast-functionality is now working fully functional again.
Found the probably related bugreport:
https:/ /bugs.chromium. org/p/chromium/ issues/ detail? id=623290
so now installed Google Chrome with the by Google themselves provided dpkg-file from their Google Chrome Website (which is Version 53.0.2785.92 (64-bit)), the chromecast- functionality is now working fully functional again.