D7Prof, IBO 4.5.Ai

I'm observing my IDE jumping into the CPU debugger on program exit (even
on a button click with halt(0) on the main form).
The final application outside delphi also continues to live as a zombie
process on program exit (no window visible, but still existing in
Taskmanager).
The CPU debugger says:
ntdll.DbgBreakPoint: int3
ret

The debug stack says:
ReleaseSessionHookRef <<<<!!!!!!!
FinalizeUnits
@Halt0
@Halt(???)
Tform.Button1Click($336B710)
.....

So the int3 happens on the ibsession.releaseSessionHookref called from a
loop in system.FinalizeUnits; (that's finalizing all included units, which
registered finalization procedures)

Anybody has any idea about that or seen that before?
Or is it a leftover debugger trigger in one of Microsoft latest patches
(installed by Windows update service)?

Regards
Gunther








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