Autoblog "Add Posts To" drop-down not working properly

We're trying to use Autoblog to replace FeedWordPress; we'd like students on our university multisite installation to be able to push posts from one of their blogs, to another of their blogs. I've installed and network activated the plugin, but on the Dashboard -> Autoblog -> All feeds -> Add New screen, the "Add Posts To" drop-down menu does not display when I'm logged in as the administrator of a particular site. It just shows the name of the current site, even though that user account has access to several sites on the network.

When I log in with our Network Administrator account and go to Dashboard -> Autoblog -> All feeds -> Add New, I get a drop-down menu, but it has no options (despite the fact that the Network Admin has been assigned the Administrator role on at least one site on the network).

I've tried deleting and reinstalling the plugin, with no difference in results.

What do I need to do to fix this?