I figured it out! The app was actually not registered properly. In the LocalServer32 key in the CLSID key didn't include the executable name. It only had the app directory. We seem to be having issues registering the app on Windows 7, but that's for us to figure out.
I have a C++ application that has an automation interface accessible via VBA. I've added the app's type library as a Reference, and the application object is initialized using the following code (this is in Excel):
dim erapp as ERStudio.Application
set erapp = New ERStudio.Application...
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