Me too. It's a constant looping pop-up notification. Shabby.
Same! Can't log in either. Any fixes?
I am Windows, but some saved Mac links that MAY help
-Mac 10.9.3 workaround https://forums.adobe.com/thread/1489922
-more Mac 10.9.3 https://forums.adobe.com/thread/1491469
-Enable Mac Root User https://forums.adobe.com/thread/1156604
-more Root User http://forums.adobe.com/thread/879931
-and more root user http://forums.adobe.com/thread/940869?tstart=0
I might have found a solution. Open the Console you should see the app that's causing the problem. For me it was InDesign. Uninstall it, quite Creative cloud and Restart or Log out and back in. Then try reinstalling the app.
So far the message is gone.