+1 for OP Steve’s fix.
I was going absolutely batty trying do import files on a local instance of a site over to a multisite implementation, but your fix did the trick.
I’ll want to say that nothing else has worked to resolve this media import problem for me, so you really saved my bacon. 🙂 So thank you, thank you, thank you!
WordPress Importer Devs: Please implement this fix, it works!
