Portal domain under SunOS render a portlet 2 times without reason?

Question

Hi,
I'm trying to deploy my portal and portlet on a server running under SunOS but what I got there was that my portlet is rendered twice in the portal. It runs perfectly under Windows where it was developed and on another one for test only, but the same ear file deployed on SunOS gives that "strange" defect.
When I took a look at the source of the page displayed in the browser I noticed that the same page could be found two times and which is more, the JavaScript at the begining of the page could be seen at four places, 2 for every page. So at the end the html looks like:<br><br>
<%-- portal tags --%> <br>
<%-- header page --%><br>
<%-- my page starts here --%><br>
<b>
<%-- the java script in my page --%><br>
<%-- the java script in my page --%><br>
<%-- the page itself --%><br>
<%-- the java script in my page --%><br>
<%-- the java script in my page --%><br>
<%-- the page itself --%><br>
</b>
<%-- portal footer --%> <br><br>
Any ideas why is that. Under Windows everything is just fine, no such duplicates.

Answer 1

The problem is adressed by Oracle Patch 4640471, but we have yet to determine if it really resolves the problem without any unwanted side-effects.
LA$$E