Failed Application Stop Hangs Enterprise Manager

Hi guys,
I have a problem shutting these down certain java web applications, if I shut down the whole OC4J instance one of my applications always fails to stop. If i try to shut it down individually it also fails to stop. So that is one problem.
However, more frustrating is that once this has happened the enterprise manager becomes unavailable. I can get the login page but then it just hangs at a blank loading screen. This stays like this until i shut down the OC4J from the command line using opmnctl.
Thankfully other applications in other OC4J instances appear unaffected.
what is going on!
cheers
neil

Do the OC4J log files contain any information on possible reasons the problem is occurring?
-steve-

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