I use Jboss 4.0.2 and the Red Hat Enterprise Linux ES release 3 (Taroon) and I have the same problem.
If the web application run only in Tomcat in Windows, works fine. But in Jboss, the problem occurs in the change of a first to second page, but in the others access it works fine.
The bad news is that I'm looking for a solution too.
If anyone have a solution or a "light", post it.
Thanks a lot,