Enabling debugger plugin on pgAdmin III

Upon many attempts and hours of search on the help pages as well as the
internet, I have not been successful to enable the debugger plugin on
pgAdmin III on Windows 7. Here are the things I have done.

1) As suggested on C:\Program
Files\PostgreSQL\9.3\doc\installation-notes.html; I edited the
postgresql.conf file that was in the data directory as:

shared_preload_libraries = '$libdir/plugin_debugger.dll' (I made sure to
removed #) (I tried this both by editing the conf file manually and (in a
separate trial) by using the GUI provided by pgAdmin.

2) I stopped and started the postgresql-x64-9.3 service (which successfully
did). I restarted pgAdmin.

3) On the psql shell, I ran command 'show shared_preload_libraries' and I
did see '$libdir/plugin_debugger.dll' there.

4) On the pgAdmin III, I ran the script '*CREATE EXTENSION pldbgapi;*',
which created the module under 'Extensions'. Which also added 22 new
functions.

However, I am still unable to see the debug option in the context menu (see
the screenshot below) of the functions, and the 'debugging' menu under
'tools' is still inactive.

My current configuration is pgAdmin III: 1.18.1, PostGRE SQL 9.3.6 windows
x64.

I have also tried PostGRE SQL 9.4.1 (both 32 bit and 64 bit windows
versions) prior to this (which included pgAdmin III 1.20 I believe).

Thanks in advance,

Ps. I also tried to attach a screenshot but the email system denied it.

*Matt *