Unless they changed the drm plugin to do something radically different it doesn't create a .mobi file from topaz books, it creates a .zip or .htmlz file, depending on the plugin version. That's why I suggested the OP check the edit metadata screen. So to view it in the Calibre viewer it would be converted from one of these to ePub to view it.
That said, his description seems to indicate he's stripping the DRM outside of Calibre, so not really sure what he's doing/seeing.
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