Everyone once in a while my hot corners will stop working. After a bit of trial and error I found that it is the Dock process that controls hot corners. Opening terminal and typing killall Dock will get your hot corners working again.
About Dustin Rue
Dustin is a systems engineer with years of experience in system design and implementation. He enjoys writing about a range of topics including how-tos, tips and current industry trends. He can be found on Twitter at https://twitter.com/dustinrue View all posts by Dustin Rue →