"Enable Editor Changes" Causes Page Styles to Disappear

Hi,

When I "Enable Editor Changes" for a theme I end up with no styles (black text, white background). Can anyone suggest how I might fix this issue please? Details as follows.

Installation:
-Windows 7 & Apache 2.2
-Drupal 7.8
-Libraries API
-Adaptive Themes
-Theme Editor 7.x-2.x-dev
-Created directory "sites/core_theme_editor"
-Went to admin/appearance/editor/settings -> Directory for theme I was editing, set directory to: "sites/core_theme_editor"
-Enabled all "Mime Type" Operations for administrator role (which I have)
-Went to: Appearance -> "AT Headliner Mobile" (Theme) -> Editor -> at_headliner_mobile.settings.styles.css
-Made an inconsequential change to that file, then saved and enabled.
-Checked change occurred in sites\core_theme_editor\at_headliner_mobile\css\at_headliner_mobile.settings.styles.css
-Reloaded page and found background had turned white

If I click on "Disable Editor Changes", problem disappears.

So, I compared the page HTML pre-change and post-change

I found that the following two lines disappeared post-change, but there didn't seem to be a replacement:

<link type="text/css" rel="stylesheet" href="http://localhost/core/sites/all/themes/at_headliner_mobile/css/at_headliner_mobile.responsive.style.css?lwosoj" media="screen" />
<link type="text/css" rel="stylesheet" href="http://localhost/core/sites/all/themes/at_headliner_mobile/css/at_headliner_mobile.responsive.gpanels.css?lwosoj" media="screen" />

Any suggestions?

Thank you.

Regards

Brett S