I've successfully setup this plug-in and have multiple authors assigned to the same post. When I click their name I get a correct list of all their posts including those they are co-authors of. So far so good.
Here's a link to a page with two authors assigned to it (site under development).
I see in "Other Notes" there's template tags to make it so I can display multiple authors under the title. I'm a graphic designer not a coder so I'm a little lost. I use the Headway Themes framework which allows me to do easy hooks as well as custom php. But I don't know how to translate the info on the Notes page to work within my framework. I've posted for help there but I thought someone here but be better able to assist.
ALSO... Once I get that sorted... will this plug-in also display both authors' boxes at the end of the post? My author's box uses custom code from the instructions here. I suppose I'll have to figure out how to change that code to do that.
If you're available for hire to deal with this little things, please contact me