Not familiar with Odystar Shuttle client, but I just had to upgrade to Mountain lion because of buying a new computer. Migrating my account from my old G5 caused some issues bringing over some old unused baggage. I found that a clean install of the system then an install of any software you want to use before migrating your old account over gave me a fresh system that runs all my new software flawlessly. Software that did not work when I migrated first and then tried to install. also Parallels works fantastic in ML if that's the path you need to take.