Spent 2.5 hours on support chat and screen sharing with adobe support today, and after many uninstalls, CC clean ups etc, they could not get it working.
Like you, it has always worked until today.
The only thing we could get to work was to login to os x as root user and run Creative cloud from there.
It's a PITA, but I am used to it because my desktop CC installer has been broken since last year, so I now have two computers with broken CC installers.
OS X Mavericks: Enable and disable the root user
good luck