I had journal article that did something like this. It was something to do with the embedded graphic (something from excel by the looks of it). I tried converting it to PS and then back to PDF but that did not help and I eventually just removed the page completely (with pdftk). If I was going to carry on I'd try extracting the page, converting it to something format, e.g. PNG, then converting it back to PDF and reinserting it in the right place. I'm no graphic guru and this is not based on any theory, except that PS and PDF are vector formats and PNG is a bitmap and going between one and other might help.
Daudi
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