Looks like there was just an App update released in the App store.
We are aware of this issue! It only occurs to the Mac version on Mac OS X 10.9. We’ll fix this ASAP!
Until then, we give a license code for the not-App Store version to any customer having this problem. Therefore, please leave a message at “email@example.com”, we’ll answer rapidly!
Yeah, the iTunes library isn’t showing up for me after the update. I’m running a retina Macbook Pro, OSX 10.9.5. Hopefully a fix soon? Thanks for including native support for the Mixtrack Quad in the latest release!
Same here, no more iTunes library visible since the update from April 23rd.
And I am having a party tonight, grrrr.