Problem defining new db connection to localhost

I have installed Oracle Database XE and Oracle SQL Developer on my local. In Developer I try to create a new database connection to the Oracle DB using:
Connection Name = localdb
Username = system
Password = <password for system>
Role = default
Connection Type = basic
OS Authentication = unchecked
Proxy Connection = unchecked
Hostname = localhost
Port = 1521
SID = xe
The Test button gives me Status : Success
When I use the Connect button, nothing at all happens.
Running Oracle Database 10g Express Edition on Vista and using Oracle SQL Developer 1.5.0.53
Any help much appreciated, Thanks, Roscoe
Message was edited by:
RoscoeF

Hi -K-,
Thanks for the reply,
When I try to create the connection the Logging page records the message: "failed to create naming Context for db connections at url: file: /C:/Users/rpf/AppData/Roaming/SQL Developer/system1 .5.9.53.38/o.jdeveloper .db .connection"
The dialog does not dismiss.
I do not have any saved connections to try to connect to - this is my first and only connection,
Thanks much for any help, Roscoe

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