Midnam does not work on my client's new iMac with Mavericks and Protools 11. Any suggestions? By the way, it does work on his Digital Performer program on the same computer.
It's possible that the Midnam isn't installed correctly. Because many users encountered this problem,. Yamaha created a support page with the installation steps. Access the page and scroll down to read about the installation procedure.
FAQ Page: http://faq.yamaha.com/us/en/article/music-production/accessories/apps/7605/7729/
After the file/package will be installed correctly, you will have the possibility to use it in the programs installed on the iMac.