I had the debugger working in pgAdminIII at one point, some time before upgrading to 9.0, but as of right now I can't seem to get it working using the usual steps. I believe it may have something to do with the DLL not loading correctly, because the following query:
LOAD '$libdir/plugins/plugin_debugger.dll';
show shared_preload_libraries;
...returns a blank row. The DLL is present, and if I change the load string, it complains, so I'm pretty sure it's finding the DLL okay, but not successfully loading it. show local_preload_libraries
returns the same thing.
Any ideas?