Big space between the Center area Post and the right sidebar
 

When using the 'ata-round.txt' settings, you may notice a space between the center area and the sidebar. What you are seeing is actually the right-inner sidebar and the right sidebar. Since you haven't put any widgets in the right-inner sidebar, it shows as a blank space.

Either add some widgets or go to ATO->Style & configure SIDEBARS->RIGHT INNER sidebar: Display on: and uncheck all the boxes