Invoice formatting problem in Sumatra PDF

I've just had a mail from a client wondering why my invoices were dark grey text on a red background. He's using Sumatra PDF (http://blog.kowalczyk.info/software/s...) and my invoices look like this to him (http://www.simonwheatley.co.uk/wp-con...). Not sure whether this is your PDF generation, or Sumatra mis-interpreting. Could you take a look, please?
 
indifferent I’m hoping you can sort something out
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