Blank Form after compiling it for Acrobat Reader

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.