Since installing El Capitan, my hard disk keeps filling up to the point my system says it will lose messages and emails. I also noticed I could not log out of iCloud. Lastly Activity Monitor is missing.
I have done all the normal things ... empty trash, delete downloads, purge unused apps, restarted, set up a new admin user and logged in from there. While doing these things did create more space ... within minutes it is gone again.
Any thoughts would be appreciated ....