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I don't have any answers, just a few thoughts on where the problem might be.
Did you make any modifications to the default phpDig code? If so, what kind of changes did you make?
Have you tried viewing the source code for the search page when you've gotten a blank screen? If so, is there anything weird about it?
What kind of search terms are you trying when you get the blank screen? Any special characters in the search words, such as single or double quotes? If so, that might be a clue as to why you're getting a blank screen.
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