I had this happen this morning. It's been reported infrequently in other Adobe forums over the years, but not in the CC Desktop forum as far as I know.
This was on Windows 10 Pro.
The fix was simple: select the Uninstall option for the app using normal Windows controls, and then do a Repair. Done.
The legacy fixes included deleting some objects and re-installing, but that doesn't seem to be necessary.
The presentation was: click on the usual CC desktop shortcut, CC app window opens, but is blank. Hovering around on it might see the mouse sprite arrow change to a pointing hand, with no hovertip, and clicking it might work, and in one try, launched Illustrator. So it seems that it's just a matter of the window content not being rendered.