Ever since I upgraded to El Captain a few days ago, whenever I click on Hazel, the O/S freezes and I have to either force quite the Finder or reboot my MacBook.

Yesterday, I contacted Apple Support and we spent over an hour running diagnostics, checking the contents of Library folders, and removing apps from startup. I only have a few third party apps; Hazel being one of them. We removed all the apps except Hazel and still had the hang issues. When we stopped Hazel from starting normal functioning returned.

What Apple Support told me was that one of the changes in El Captain was additional low level security around the O/S. He said if Hazel is monitoring the file system, it is possible that is the problem I am experiencing.

Alan