Hi Mike,
Sorry for the delay. The whole team has been busy with JavaONE for the past week.
We currently do not support reverse engineering of an operation to a sequence diagram more than one level deep. I opened an enhancement request for you:
http://www.netbeans.org/issues/show_bug.cgi?id=103780
The UML pack is now part of NetBeans. Check out these links for the latest info regarding UML:
http://www.netbeans.org/products/uml/
http://uml.netbeans.org/
Thanks,
George