Thanks for posting. Our initial testing has not found any major issues with running SmartMusic 2012b on Mountain Lion. Our download installer is not currently digitally signed with Apple, so you may have to change your Mountain Lion security permissions before being able to run the installer. We will continue testing and make sure we keep everyone informed if any issues arise.
These on-line forums are intended for the exchange of ideas among the users of MakeMusic products. If you'd like individual help from our technical support staff, please contact us directly at www.smartmusic.com/support.