JBoss debug session stalls on launch

Since upgrading to NitroX_Struts_IDE_2.1_425 and Eclipse 3.1 I have problems running repeated JBoss debugging sessions. Typical behavior is:
1) Start a debugging session in JBoss (4.0.2).
2) Stop the session using the "Stop Server" button in the Eclipse Console window.
3) Wait for everything to shutdown nicely.
4) Try to start another session.
5) Within the console, I see the normal JBoss startup stuff going by. When it gets to loading my app, sometime during the init process (and it varies where), it just stops loading. JBoss as a whole also stops loading - I can't even access the JMX console. It's like one of the threads just goes down a blackhole. Or, possibly, according to the Eclipse debug window, many of the threads just disappear. Killed?
This happens about 90% of the time, though randomly it will work for a couple of cycles in a row and then not work. It does not appear to be related to me changing any code. I can just launch, stop the server, relaunch and it happens. Sometimes when it is stalled, I can force it to terminate and do a relaunch and it will work (after a few terminate-relaunch cycles). Usually not.
The strange thing is that it will vary from place to place over time, but will usually stall in the same place for a while (several days or weeks), and then will suddenly start stalling in another place. For a long time, it stalled initing a certain Hibernate class mapping. Now it's stalling loading a certain config file.
If I quit Eclipse and relaunch it, then I can normally launch a session without a problem. Sometimes even that won't get it past the stall. I have to quit Eclipse again and relaunch.
The stalling behavior never happens when I run JBoss outside of Eclipse/Nitrox. It also never happened prior to the Eclipse 3.1/Nitrox upgrade. (Just to add to the list of variables, I also moved to running under JDK1.5 at the same time.) This is all on a Windows XP Pro box.
Has anyone seen any similar behavior, or have any ideas of how to further diagnose the problem? As a developer, I know I'd shoot myself if I got a bug description like this - multiple variables, no exact reproduction steps, etc. - so I'm not looking for an instant fix. Just ideas on what info would be good to get to try to track this down.

Hi,
Build 425 does not support "JBoss 4.0.2". This has been fixed and should be working fine in the next public release.
Thanks,
M7 Support

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[svn] 4628: Fix FB-15947: Terminating debug session closes Safari window including tabs not launched by debugger

Revision: 4628
Author: [email protected]
Date: 2009-01-22 15:45:06 -0800 (Thu, 22 Jan 2009)
Log Message:
Fix FB-15947: Terminating debug session closes Safari window including tabs not launched by debugger
Ticket Links:
http://bugs.adobe.com/jira/browse/FB-15947
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Revision: 4628
Author: [email protected]
Date: 2009-01-22 15:45:06 -0800 (Thu, 22 Jan 2009)
Log Message:
Fix FB-15947: Terminating debug session closes Safari window including tabs not launched by debugger
Ticket Links:
http://bugs.adobe.com/jira/browse/FB-15947
Modified Paths:
flex/sdk/trunk/modules/debugger/src/java/flash/tools/debugger/concrete/appleScriptCloseSa fariWindow.txt

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@kglad
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