How do I reset Mixcraft to factory default settings?

There is a file called "Reset To Factory Defaults" that is in your Acoustica Mixcraft 9 program files folder.  Quit Mixcraft if is open, then run the Reset To Factory Defaults File. By default, Mixcraft 9's program folder is here:

C:\Program Files\Acoustica Mixcraft 9

Resetting Mixcraft to factory defaults can fix a variety of issues.