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there is no 're-install'...what you could try is renaming your system188.8.131.52 directory in your $HOME#/.sqldeveloper directory. That will make all of the application settings 'go away' for your OS user
This was helpful. What I did was I moved out system184.108.40.206. Then restarted, imported settings from 4.0, then restored preferences.xml and settings.xml in o.ide.220.127.116.11.42.150520.751/ and all my connections and preferences appeared.