Models management problems on ARIS 9.8

Dear all,

We have installed ARIS 9.8 Design Server and and Oracle DB Server on Linux Red hat 6.6.

As client browsers we are using IIES and Firefox.

After finishing the installation, we realized that we can manage everything (create new DBs, groups, models and objects) normally, except manage the contents of models and objects. Even the context windows's functionalities as open, edit attributes, properties, etc. are inactive.
Can someone give us a clue, at least?

Thanks in advance for your help.

Regards,

José Camacho