A few problems which I don't think I've seen in the forums:
1) After I start or restart my computer, MC can't find the path to my library. So I have to re-import, takes less than a second for over 7,000 files ( so it's not actually re-loading the files), and it plays fine. But it's a pain to re-install the library every time you re-boot. Is this normal?
2) Also, "minimize" button does NOT work. And I thought I read in one of the Builds you moved the "Minimize, Maximize, Quit" buttons to the left side to be more Mac-like. Mine are still on the right side.
3) "Check for Updates" doesn't work. Error message: "There was a problem when checking for updates..."
4) And lastly, after playing MC for a while, sometimes it just freezes on the album I'm playing now and I can't change the album, can't go to "Artists", or "Genres", etc...Views. After I Quit MC and Re-launch it, it works OK.
I'm running Build 156 and OSX 10.8.3.