I made a form in LCD ES4.
To enable the saving of filled forms in Acrobat Reader, I opened the form in Acrobat DC (also tried it in XI) and saved it with "File > Save as Other > Render extended PDF > Enable More Tools".
When I now open the newly saved PDF the document is empty.
You can download the form at http://www.smilecom.ch/lcd-empty-problem.zip
Thanks for any input.
see my response at Blank Form after rendering for Acrobat Reader