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I checked both the app that doesn’t work and the one that does – both are loading the TWAIN_32.DLL from the same place and if I enumerate all of the .DS files that exist, both apps come up with the same list. What I have discovered is that the scanner in question has a single .DS file that seems to expose two ‘sources’ – one that is WIA and one that is not. My app that is having the problem shows the WIA source, but not the non-WIA source. All of the other apps show both sources. Is there something that I’m missing that could be telling the source manager that it should only show the WIA source? I can’t find any differences between the implementation of the two apps or the way it is loading and communicating with the source manager.