virual kiosk and sandbox can't find firefox

I have been using the virtual kiosk and opening Firefox in it. About a week ago Firefox disappeared from the browser options on the menu, and the desktop shortcut for virtual Firebox produces a box saying “the specified path does not exist”. Yet the path is correct and Firefox readily opens on this path outside of the Comodo kiosk and sandbox. I did nothing. I am not sure whether Firefox issued an update around the time this problem began.

Never mind. I reset the sandbox and it fixed the problem.