This will be included in the next release, but it also works fine with 0.9.2 so why wait? 

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What this updated file does is makes sure that any "full bleed" background images actually do fully fill the page.  There was an issue on Android and Windows phones with widescreen displays showing a blank strip down the right-hand side of pages with full bleed background images.  This new "thisissue.css" template adds a specific layout condition to address this problem and also heads off any issues with pages wider than 320 pixels and narrower than 480 defaulting to the 480 width images to ensure full coverage (potentially an issue with some Android phones depending on browser zoom level and screen resolution/density setting).

So grab this update, unzip it, and use it as a template for your future issues.  You can also use the media queries as a guide for how to edit existing issue-specific stylesheets to address this error.