Different background transparency when presentation opened then runfrom when file name double-clicke

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MB

I made up a very simple Powerpoint 2007 presentation displaying some
forthcoming events. I added a background image on a few slides and
adjusted the transparency so the image was quite feint and the text
easily readable.

This worked fine when I opened the file from within Powerpoint then the
Slide Show run.

Later I just double-clicked the file name to view the slide show and
found that the background images were not at all transparent so the text
was hardly readable.

Is there a way around this problem
 
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