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You do not mention any details about your environment: SQL Developer version, OS, Java JDK version, third party JDBC drivers installed, and so on. That might help get a better answer. However, here are a couple of possibilities...
Do not use Java jdk1.7.0. Use jdk.1.6.0_11 or higher (up to _27) instead. With 1.7, Connection view may not appear.
or try this...
a) Export all your Connections
b) Exit SQL Developer
c) Delete C:\Documents and Settings\<username>\Application Data\SQL Developer\system<x.x.x.x> (or equivalent)
d) Start SQL Developer and decline to migrate preferences from a prior installation
e) Import the connections xml file created in step (a).
The later approach sets all preferences to default values and clears up any corruption that may be present.
SQL Developer Team