Though it still works (just is annoying), I’ve just disabled the plugin until it is updated; just keep voting that it’s broken, eventually they will fix it with a patch or something.
This is what we get for using version 0.x of any software; it’s a gamble.
I can confirm this bug as well.
Pro-tip: if you delete “http://” from the redirect box (when you don’t want a redirect) you should be able to publish the post.
Not sure but I think the bug has something to do with gdd_spr_url not being ‘focusable’?