FORMs wont display

We currently are migrating from 6i to 11g. I have this major problem:

When I use a configuration, i.e. use "config=XXX" in the address line, the form/application works fine

When I use the form parameter, i.e. "form=form_1234" in the address line, all I get is the ORACLE splash window and nothing else:

This problem started after I started using "configuration" for the application instead of calling the "main" form, i.e. I previously was able to run individual forms using the "form" parameter.

The server is WIN 2008,

WebLogic 10.3.6.0

Fusion Middleware 11.2.1.0

Java 1.6.0_24

What do I need to do so that I can run individual forms again?