iCloud Drive has no Options button
Every now and then, the iCloud Drive "options" button disappears (in System Preferences > iCloud)
Also, even when it does reappear, when I click on the button - the list of applications storing data in iCloud Drive is completely empty.
It's really annoying because my data no longer syncs with my iPhone and other devices.
I am running 10.11.6. I have tried running a combo update but it won't let me. Says it can't be run.
I have also tried signing out and back in. Turning iCloud Drive off and back on.
I noticed last time when this happened, it all started working again after 3 or 4 days.
What is the problem and how can I fix this?
Mac Pro