In fact, that problem should only prevent me from being able to debug both projects at the same time. I went ahead and set my reference to the .exe rather than the .vbp. It should at least behave the same way when I run the test project. But it doesn't. I don't get the form coming up which the ActiveX component should be displaying. I just get nothing happening, rather like the nothing which happened when I tried Andrew Peter's suggestion for converting my own project. Is this indicative of some 'problem' on my setup? I'm using VB6 with SP6 on Vista.