I'm workign on a new theme and I'm having an issue with the tiled galleries. The content area is 600px but for some reason Tiled galleries max out at 500px leaving a white space on the right of them. I don't have this issue in the default WP themes, so I'm guessing there is something in the theme's css causing this. I've already tried copying twenty twelve's gallery css and that didn't help. Checking the page source I see the width of the gallery at 500px. Any help would be great.