Pretty much same here. I see the splash screen for half a second and then nothing. What hardware are you running on? I'm on a mid-2007 iMac with 4GB of RAM running OS X 10.10.
Intel Core i5 3450
Nice to hear, that you have a splash-screen....I see nothing
Bingo! Worked for me!
Try signing out of the Creative Cloud Desktop application, then sign back in: helpx.adobe.com/creative-cloud/kb/sign-in-out-creative-cloud-desktop-app.html
just forgot to delete the files in the SLStore-Folder .... Now it works fine....
Thanks for your patience