I have dropbox on 3 computers and 2 iDevices. Since I updated 1 computer to Yosemite, it is no longer updating, and it's not clear that dropbox is even open often. To get it to update, I have to reboot completely and try to launch dropbox from applications, often multiple times. Eventually, it will take and update, but then the next time I think I have saved something, it doesn't show up. Any fixes you know of?