Lightroom 6 quit unexpectedly
Coming from Aperture and Lightroom 4, I installed Lightroom 6 (standalone) on my MacBook Pro Retina (2014, Yosemite). However, it won't launch. All I receive is the credit page and then the enigmatic message "Lightroom quit unexpectedly." Anyone else experiencing this? Any solutions? Is it an Adobe or an Apple problem?
Thanks!
MacBook Pro with Retina display, OS X Yosemite (10.10.3)