>However, when calling a method, I get unknown COM status code.

I've foudn some timeing problems with the SOAP client, try this:

loUniversalThread=Createobject("mssoap.soapclient")
loUniversalThread.mssoapinit("http://205.205.57.3/WebServices/universal thread.wsdl")

wait window timeout 2
? loUniversalThread.mymethod("test")

Oddly enough, the VFP7 Web Service FFC class (that uses almost the exact same code) works just perfectly. Consider using that (its far easy to use that in the first place, cause Intellisense can do it for you).