The answer is out there. It's looking for you. And it will find you, if you want it to.
So, you're just not telling.
I only know that there has been several bug fixes to JavaGroups/clustering so if you're using that you should try to update to 3.0.6 as soon as possible.
See Sacha's note: http://www.jboss.org/modules/bb/index.html?module=bb&op=viewtopic&t=forums/