As you can see in the image below, when I change the PDF display to "Interactive" the field holding the PDF becomes blank.
I had originally thought this problem was because I had PDF Pen Pro as my default PDF viewer, but the same problem happens when I changed PDF handling back to "Preview" (the default).
I'm using FMPA 14.0.5
Mac OS version: El Capitan: 10.11.4
Mac Memory: 32 GB
Look forward to hearing back how to fix this issue.