Background image not showing in preview pane for outlook 2013

Hi,

I'm new to using background images in emails and I'm testing some code generated here:
http://backgrounds.cm/

I'd like to use the fit-to-cell option, but when I look at the email in outlook 2013, after downloading the images, the bg image doesn't show in the preview pane right away. Only after I resize the window or open up the email in a new window will the image display. Has anyone else seen this behavior?

Thank you,

Eben

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