SQL developer starts and then disappears without any warning

Hi, guys:
I need to use SQL developer where there are existing connections. however, SQL developer 3.1 asked the java.exe location, and I chose java 6, now I can launch SQL developer but not able to continue running it. SQL developer starts and then disappears without any warning. Could anyone help me on this problem?
Thanks a lot!
Sam

Can you start the exe from the BIN subdirectory? That should open a command console, and maybe you can see any error messages there that explain what's happening. For step-by-step directions, here's some help:
http://www.thatjeffsmith.com/archive/2012/06/how-to-collect-debug-info-for-oracle-sql-developer/
OR
Install SQL Developer to a new directory and run it from there and see if that helps you get around your current install's issue.

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