This has happened twice now in a week. The icon loads when the computer is turned on, but when I click on it and try to go to options/properties to adjust what files are syncing the icon disappears and I can't do anything with the app. I don't think it is syncing files that I create and save. This happened last week. I deleted Dropbox, reinstalled several times. Uninstalled a Windows update, thinking maybe that was the cause. Somehow it came back and started working again. Now it is gone again. Anyone else having this issue?