EA3 Errors

Question

Have upgraded to the latest SQL-Dev 3.1EA3
Connect to database, bring up table list, click the "+" symbol to view column list and an error "Your database connection has been reset. Any pending transactions or session state has been lost."
Click ok. Of the tabs in the main window, all work except the "Columns" tab which remains blank.
Trying to reopen any other table will give:
An error was encountered performing the requested operation:
Closed Connection
Vendor code 17008
Any ideas?
Full details below:
About
Oracle SQL Developer 3.1.06
Version 3.1.06
Build MAIN-06.82
Copyright © 2005, 2011 Oracle. All Rights Reserved.
IDE Version: 11.1.1.4.37.59.48
Product ID: oracle.sqldeveloper
Product Version: 11.2.0.06.82
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Answer 1

Hi,
You might also try forcing SQL Developer to use the 11.1 jdbc drivers included with SQL Developer:
Re: Sqldeveloper and multiple homes - how to force it to use included jdbc
Or, if you are adventurous, you can try read through this thread:
Re: SQL Developer: Not able to view tables
It recounts various actions other users took in similar circumstances. Like switching from shared to dedicated server, using the Thick/OCI driver, setting disableOob=true, and so on. Something is bound to work.
Good luck,
Gary