I cannot track down this problem... I have lost all audio output from Sonar to my Audiobox USB, which is acting as my soundcard... I get audio from other sources, when I play mp3s or stream videos online, or even playing my keyboard... but no output from Sonar. Even on old saved projects where no settings have changed it looks like all the I/O has been reset, my inputs are set to -none- and outputs to Master... any thoughts?

I have this sometimes. I just reset the output, and it's usually fine. Sorry I cant help

On further thought, it sounds like a preferences issue. Check and see if your audiobox is listed under "devices". Then see if it's checked.

Reset the output where? On every individual track in every song? Or is there some global option I'm missing? And yes, the Audiobox ASIO device and drivers are still selected in my prefs.

I usually just have to reset the output at the bottom of the master buss in the console view.

Check the master outputs, in console view, as said above, and anything else tide to them, if that does not solve...I got the same problems....I think it started with MS updates..but cannot be certain of that.
 

It seems to be set correctly... also if I create a new track the Audiobox shows up as an option, but no options to choose left channel, right channel or stereo.

Is it grayed out? Is there any other option that shows up?

In MS win control panel under audio/speaker...what is the default sound device selected?

In my operating system sound properties, the Audiobox is chosen and the speakers test out okay. The output on my master is set to the Audiobox as usual.