In certain cases, when using a background image for a form project a 0KB PDF output can happen.
A known resolution is:
Open Regedit
Navigate to HKLM\SOFTWARE\WOW6432Node\Prism Software\Reformer5
Create a DWORD 32-bit value named PdfDistillerBufferSize
Set its value to 524288
Note: Default value without this key is 1048576