My Sonar X1 Producer was working perfectly fine on my 64-bit Windows 7 until I accidentally installed ASIO4ALL program. That Asio4All program was accidentally installed as it comes together with another VST (it was my mistake bcoz I clicked too fast during installation).   Now, when I open a project in Sonar, there is a menus saying "The following tracks and busses are currently assigned to a silent hardware output. The items listed below will be silent in your project until their outputs are reassigned to an appropriate hardware output". And then there is a box that says "Master".   In the past when I saw this msg, all I have to do is just to restart my PC, and the problems will be fixed. Now, with this menus popping up each time I open a project, there is no sound coming out from my studio. This is a big problem now. Is there any way that I can configure things correctly?   I have tried uninstalling Asio4All program and restart the PC, but the same problems still exist. Please help, anyone?  

Go into preferences > drivers. Uncheck the ASIO4ALL drivers and check the boxes for the drivers you want to use. Apply and close. Play some of the project, then close Sonar. Open it up again, and it should retain the settings you made, with ASIO4ALL disabled and your other interface enabled. Also, there should be an ASIO4ALL uninstall routine you can access from Start > All Programs > ASIO4ALL folder.

I had tried asio4all, don't really work that well. Still like the original ASIO more than anything else.

I wonder if the OP has reassigned the outputs at the track level and buss level?

Even though the correct audio device is selected in preferences doesn't mean the project is automatically going to reset itself.