I have the same symptoms. I had this on Mavericks and then on Yosemite. Same symptoms. Black screen with cursor, and swiping between workspaces shows them during the transition, but then goes dark again.
I have previously had Creative Cloud installed, but had removed it months ago. I did have Spotify (though it was not usually open) and have removed this (and Deezer) to see if that will fix the issue. Will report back.
Tom