11
What screen resolution are both your computers.
mine the computer I'm currently running is 1280 x 720
You need the opinion/advice of someone like Kris or Ana to design a theme that will work well in different resolutions and browsers.
I only mention this as the other day I got a report from one of my sites that they had to scroll right to view all the site, I asked their res, and then changed my computer to reflect their settings and the same happened this end.
Take care
Kind Regards.
Tom
http://bassmanthemes.com
http://www.xoopslance.com