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>When the object is launched from VBScript in a simple ASP page I added to the same site, it works perfectly. It's only when I try to call a method from the code behind, using the com DLL wrapper, that it throws the error. I've even added the old ASPCOMPAT="true" to the headers of all pages that access the dll - what am I missing? Do I have to tell the code behind to use the DLL somewhow?
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>Thanks again for the response - all hope is not dead ...(yet).

You didn't happen to re-compile and/or change (or add) the methods/properties in the COM component did you? If so, you'll need to delete the reference to the COM component from the .NET project and add it back it. That forces .NET to build a new wrapper for it. Then replace the DLL's on the server with the ones .NET generated.