I have no idea why it shouldn't show properly if you are both working from the same area, especially if you are using the same Software.
When you apply the template, you do have to import the CSS file to the template, otherwise it will remain plain, that's the only thing I can think of. Not unless there is already a link to the External CSS file in the template. Other than that, a setting change somewhere? Failing that, I have no idea. If you figure it out, post it on so we all know in the future.