Problems printing a digitally signed PDF

Hi
I'm having problems printing a digitally signed PDF on a dell 968 AIO printer. It works fine on the a majority of printers but we have had reports of issues with other models as well as the dell printer.
The PDF prints fine when opened in Adobe Reader 9 (blue bar appears at top to indicate signed pdf).
When opened in Adobe Acrobat 7 on the same PC the first pages prints correctly but the rest of the pages print only a few lines in a huge font and the characters are backwards.
The pdf does not always open in reader when accessed through the web it will sometimes open with acrobat is there anyway to control this?
Does anyone know why this maybe happening?
Thanks
Claire

Thanks for the reply Mike. I think I've got a little further with this problem now. There seems to be a problem printing the signed PDF in adobe reader 7 as well as acrobat 7.
I have uninstalled acrobat from the machine but the problem still happens with reader 7.
Does anyone know if reader 7 and below has any known issues printing signed pdf's. It works fine on 8 and above.
thanks
Claire

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