Stumble Upon toolbar problems
October 1, 2007
*I wrote this post back in October of 2007, since then the resolution to this problem does not work anymore. I recently had this problem again and the only way I was able to fix it was to not only uninstall the toolbar, but I also had to uninstall firefox and reinstall it, then add the toolbar.
Ever since the last update from StumbleUpon, every so often the tool bar disappears for no reason. If this is happening to you, uninstall the plug-in and then reinstall it. It will bring the bar back, and you do not have to set everything up again since your login information does not get deleted by uninstalling the bar.