I created a simple COM objecj in Vis C++.  It has a method "hello" on it that does nothing except return S_OK, and a property "bar" that returns a string.

I can use com_load to create the object and I can get the property string back out (com_propget), but if I call "hello" then it returns FALSE.

$svr = com_load( "SIMPLECOMASP.NKMSimpleObj" );
$foo = com_invoke( $svr, "hello" );

if ( $foo )
  echo $foo;
else
  echo "No";

I created another method taking a BSTR input and a BSTR* output and that always returns false with the output being empty.  I tried the calls from VB as well, and they seem to work OK, so the COM oject looks functional. If I run the COM exe from the debugger, I can trace through the functions - so they *are* being called, just a bogus return code from somewhere.