Blank invoice attachements

[katie@morsosparesdirect]

Hi, I am using Virtuemart 3.0.12 / Joomla 3.4.8
I have both Paypal and Worldpay on my website.  When someone pays through Paypal I get both a shopper notification and an attached PDF invoice.  When they pay through Worldpay, I get the notification but the attached PDF invoice is blank (when I say blank, it's showing the company header/address and the invoice number/date at the top but the rest of the page is blank).  Any help would be really appreciated.
Thankyou

[GJC Web Design]

the current latest versions are Joomla 3.6.2 & VM3.0.18

I would try that first with all the normal warnings about upgrading

If you delete the pdf invoice from your site and remake it from the admin do u see the same problem?
Try with error reporting etc full up

[katie@morsosparesdirect]

Thankyou.  This has been done and I'm now running Joomla 3.6.4 but the problem remains.  I'm getting the complete invoice attachment for Paypal but not for Worldpay.  Any other thoughts would be really appreciated.