Enterprise Manager 10g DBControl - Listener doesn't appear on home page

I have a testing system, running on Microsoft Windows Server 2003, Enterprise Edition, Service Pack 2 with an Oracle DB 10g v10.2.0.3.0 installed. A few days before today I found out that I don't have the link with the listener on the Enterprise Manager DBControl home page. I'm attaching a print screen with the image I have on the home page.
[http://img249.imageshack.us/my.php?image=listener20090126de7.jpg]
I didn't observe if this problem got from the initial installation, but I think it didn't, as this was a clean system and everything should have worked fine. Yet, since the initial installation the system got into some changes regarding the Operating System and I refer to the name of the server by joining a domain and got added the suffix of the domain. The listener works fine, I can connect from any workstation and do whatever I want, but the link with the listener doesn't appear from anyplace I try to connect and do something.
Please help me if you know any solution regarding this.
Thank you.

Hello and sorry for being late with an answer.
I solved the problem so now I can't try the last solution to see if it helps. The solution I chosed was to deconfigure the DBControl with EM and then reconfigure it back.
On one hand this helped solving the problem, but on the other hand all the settings made in EM got lost. There was no problem losing these settings as this was a test system. If it would have been a productive system having more settings in EM I don't think I'd choose the same solution I mentioned above.
I'll mark the question as answered but mentioning once again that I don't recommend this for a productive system.
Thank you all for the suggestions.

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