Playing around

I decided to try making a scripting engine stub in C#. I got it partway working. The various scripting hosts can start the stub and invoke a few of the methods in it, but for some reason, they all fail at some point or another. It is a bit mysterious because I don't have a debugger that can handle this, so I'm relying on print statements. But one scripting host just stops calling the engine after initializing it. There doesn't seem to be an error, it just hangs up. I suspect it is a failed query for an interface, but I'm not sure how to go about finding out which interface.