I updated to v6.7.0 last evening, and now only the menu bar appears - the star chart is not displayed. Also, most of the menu selections are greyed out. The "Telescope" menu has active options, but they do not work. SkySafari is shown in the dock, but not in Mission Control. I tried rebooting, then removing and re-installing the app from the App Store, to no avail.
I am running a Late 2009 Macbook with OS X El Capitan. Any ideas?