Problem with hyperlinks when exporting to PDF

I wonder if there is anyone out there who is having /had the same issue as me using Crysatl 2013 support pack 1??

I have a report, which has some fairly simple hyperlinks set against some fields, which work fine from within Crystal, however, when I export them to PDF, the hyperlinks seem to be getting lost.

I'm 99% sure this has been working fine, but seem to be having problems since moving from XP to Windows 7. I'm sure there is nothing wrong with the PDF viewer I'm using, as I've tested with other PDF's and that seems to work fine.

Can anyone help???

Thanks

Scott