Hmmm. That's a strange one that we haven't heard of. How did you remove JFBConnect, the normal Uninstall method within Joomla? When you re-installed, did you see any errors that you recall? Finally, can you try going to:
And see if the page loads correctly? That will help us know if it's just the menus that are missing, or if there's more problems underneath.
Please let us know what version of JFBConnect you're using. Also, please note, that support is for active subscribers only. If you'd like us to look into this further, please post from the account you have a valid subscription from.