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While coding a new module, I was making it's templates use the standard .item css classes in XOOPS theme. However, many of these new XOOPS themes don't properly address .item (color wise) so even though a module uses .itemHead it will not display according to the rest of the site. The default XOOPS theme has this done right.
So, when I release my new module and it seems to be lacking color in your theme, now you know why