can't invoke the debugger

Hello,
my problem is not new, but the solutions I have found so far didn't solve it.
My system is: PostGreSQL 8.4.0, PGAdmin3 1.10.0, Windows Vista Enterprise SP1.
The problem is: if I try to start the debugger by a right-click on a function there is no
debugging option in the context menu. The debugging option in  the pulldown menu is
disabled.
I tried/checked the following:
1.) I have access rights for the function (owner).
2.) plugin_debugger & profiler.dll are in the lib directory - o.k.
3.) checked lib directory path (show shared_preload_libraries;)  - o.k.
4.) executed pldbgapi.sql successfully
5.) I did a database restart

PGAdmin3 shows still the same behavior.

Thanks a lot for any help on this.
Oliver



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