I am currently using the up to date version of WP and ATO
Url:www.artiisanphotography.com
Problem:All the gallery's are aligned to the left/navigation buttons will not follow when centered
Attempts: I've tried to go to the static pages and enter "<center></center>" html tags as well as "<div align="center"></div> ". The widget itself will align but the navigation buttons will not align as well it seems to be a un aligned border on the background of all of the images themselves. I've tried to contact the plugin/widget creators but have reached a dead end.

For the menu buttons have you tried using the %page-center? Also the code to center the content in a div is

<div style="text-align: center;">Content of div</div>

or to center a div in an area you would use the following

<div style="width: 300px; margin-right: auto;margin-left: auto;">Content of div</div>

<center> is deprecated