Cloner dumps me to login screen

Cloner is dumping me out to the login screen and then, after I log back in, the new site doesn't show in network admin/sites. If I go to the new site's URL directly, it's there but its incomplete, and it won't let me log into it (it says I have no privs to the new site).

I've tried twice.

I expect it's a server security setting of some kind but I don't see anything in the logs.

Any thoughts?