Hi Luke My Acrobat page display preference - 'Use overprint preview setting' was NOT set to Always. It was set to 'Only PDF/X-5 compliant ones.' I have now changed it to Always, however I still get the same results when converting to pdf, it hasn't solved the issue. In regards to Adobe Reader, I asked a colleague, who only has Adobe Reader, to open the pdf on their computer and it displays as it should, all coloured cells show up. When I open the exact same pdf in my Adobe and they are not shaded...
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