1. Check your security settings in Adobe (step 2 in the link)
2. Disable Print in GrayScale in Adobe
Open Acrobat Reader DC application
Open any PDF in it
Go to File > Print
Under Print dialog box (or in the settings/options for your printer) check whether the option 'Print in grayscale (black and white)' is checked or not If it is checked, please uncheck it.
3. Visit http://help.smartsource.com/customer/portal/articles/1389640-why-are-my-coupons-printing-with-blank-spaces- for more information.
If this doesn't fix the issue, please email email@example.com with your coupon and email address.