I ran Dependency Walker on the application, when I run it on the dll I get the following error:

At least one required implicit or forward dependency was not found.

This was for, I believe, LIBPQ.DLL, I do not get this error when I try the other plugins. So I guess this is teh problem, but I'm still unceratn where to go from here, although it does give me something to Google.

The application was origianlly in debug mode, I now have it in release mode, but no difference.