I have also had blank pages before resulting from miss-edited smarty code in the theme, by the looks of it though you arent trying to edit any smarty code.
The only thing I can suggest is to try a different editor, I use dreamweaver but there are otehr alternatives out there just google for free html editor or something once youve found a good editor try editing a fresh copy of the blue shine theme.html re-upload it, clear templates_c and see what happens.
Good luck.
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