I had the same problem. It turned out that Dropbox requires the Notification Area applet, which isn't installed by default. Hold ALT + Win, right-click in the Gnome panel and add the applet. See if that solves the problem...
I had the same problem. It turned out that Dropbox requires the Notification Area applet, which isn't installed by default. Hold ALT + Win, right-click in the Gnome panel and add the applet. See if that solves the problem...