Cannot list tables (views, packages etc) from Oracle 11 database using sql explorer, but can see them using PL/SQL Developer I am connecting to oracle 11 DB. 

When I connect with PL/SQL, I can explore all the objects :



However when accessing this same DB using Oracle SQL Developer, expanding the different objects results in empty list



Any ideas why this might be?
SQLDeveloper  shows tables that are owned by the logged in user. To see other users' tables, right click on connection ("dev" in your case), click "Schema Browser", and then select a user whose object you want to see. 

Or directly query system views (e.g. all_tables )