Are you using V3 Final release ?. I will get back after talking to admin team.
A not-so-good workaround for you is if you change the masterpassword then add the following jvm-options to domain.xml
javax.net.ssl.keyStorePassword=new-master-password and javax.net.ssl.turstStorePassword=new-master-password
[Message sent by forum member 'kumarjayanti' (vbkumar.jayanti_at_sun.com)]
http://forums.java.net/jive/thread.jspa?messageID=385851