Just to clarify, you DO have a creative cloud subscription, right? If you do, try signing out of the creative cloud application manager and then signing back in. Is Photoshop working properly?
Yes, I've had a CC subscription since it was started. Photoshop CC 2014 works fine (including installed plug ins). I have also tried deleting the Lightroom preferences file and then re-booting. Still no luck. Please advise. Thanks.