Button in PDF form does not work on MacOS Mojave

[asdfghjkl2]

I'm trying to fill out this form using the latest version of Acrobat Reader on MacOS Mojave:

https://www.uspto.gov/sites/default/files/patents/process/file/efs/guidance/updated_IDS.pdf

The buttons in the PDF don't work.  The "Add" button is supposed to add a row to the table, but it just flashes yellow and does nothing.

Why doesn't this work?

[try67 · Accepted solution]

What exact version of Reader are you using? Did you open the file in any other application beside Reader?

[asdfghjkl2]

Yes, I must have opened in Mac Preview before using Reader.  Downloading a new copy and opening in Reader works.

Huge fail on Adobe's part for not at least providing a decent error message in this situation.  😞  No wonder that Mac users prefer Preview and only use Reader when they absolutely have to...

[try67]

So it's Adobe's fault that Apple created an application that corrupts PDF files just by opening them? Some twisted logic there, buddy. And it's not only LCD forms, by the way.