[Theme: Catch Box] issues with child-theme, width, and menu links

Hello,

Background: I have Catch Box 1.4.1 on WordPress 3.4.2. I’m running with Single-Column No Sidebar. I’m also running wp-ecommerce 3.8.8.5 with several additional plugins.

I have created a custom menu that links to several pages as well as to product categories from wp-ecommerce.

On a laptop running 1366×768, Catch Box uses the following to limit page width.

/* One column */
.one-column #page {
	max-width: 690px;
}

If I update the style.css in the theme to be

/* One column */
.one-column #page {
	max-width: auto;
}

Then the screen fills up more of the window properly instead of being scrunched up. The menus still work correctly.

Where this goes wrong is when I try to create a child-theme to have the page width changes persist across updates.

/*
Theme Name: Catch-Box Child
Description: Child template by Sam
Author: Sam
Version: 1.0
Template: catch-box
*/

@import url('../catch-box/style.css');

/* One column */
.one-column #page {
	max-width: auto;
}

When I do this, the pages look correct, but the menu links to product categories in wp-ecommerce disappear.

I’ve tried disabling every plugin except wp-ecommerce and it still doesn’t work.

How do I get both the width to display correctly as well as having the links to the wp-ecommerce pages display?

Thanks,
Sam