AutoBlog - Add New Feed Fails To Load

I'm trying to use AutoBlog to post content to my website and have noticed that when you click add to a new feed only half of the page gets displayed and the author box and below is missing. I have over 16000 subscribers on the site and I'm guessing that it's trying to load all of those subscribers in the list box when trying to populate the form.

Any thoughts on a workaround to restrict that authors box to admin accounts only, of which there are two.

Thanks in advance for your help.
Cheers
Paul