Sql developer not showing table/view names

I just set up a new machine, the database settings are same as in the old machine. But I cannot see the table/view names when expending the "+" sign before Tables or Views. When using "select * from tab", the result of all tables/views returns correctly. Is there any other settings I missed?
I'm using Oracle Database 10g Express Edition, and Oracle SQL Developer 1.5.5.

The same issue exists in 2.1.1.64.39
All of a sudden: list of tables empty, views still viewable,tables are still there though.
In the logging window I get ora-904 messages on sys.o.name
Sybrand Bakker
Senior Oracle DBA

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