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Keep in mind that 3.0.02 was an early adopter release, and not even the last one prior to the 3.0.04 production release. It's always best to migrate your settings from an earlier production version. Try removing the settings folders under C:\Documents and Settings\<user>\Application Data\SQL Developer for the earlier system3.x.x.x.x versions, then start-up SQL Developer again and do not migrate settings, or migrate from a production system2.1.0.x.x folder like system22.214.171.124.73.
Make sure you have a good connections export or backup of your latest connections.xml. Finally, use a JDK like jdk1.6.0_11 or higher, but not jdk1.7.0.
SQL Developer Team