Not necessarily another structure, but do “Saving Changes” with your existing default structure. Note that with the default structure I would expect your link to be something like: http://www.improvethequality.com/?author=1
That is what I thought as well, I have deactivated all the plugins I thought could affect it one at a time. The theme works on my dev site. In fact this whole thing works on my local dev site. (it isn’t a perfect copy of my real site) I just can’t find out the difference.