🚀 go-pugleaf

I have created a document with form fields which are "stacked" on top of each other. All but one of the fields are hidden, and depending on a button which is pressed, a different one in the stack will be visible. There are other form fields which are not stacked on the form. The reader version on my PC is 5.0.5 dated 10/26/2001. I also have the full version of Acrobat on my PC.  I can use the form with no problems. When other users download the most recent reader version from the Adobe website, they get version 5.0.5, but it is dated 9/24/2001.  When they access the PDF form on a web site, they cannot access the "stacked" fields at all. Drop down boxes to not work, and they cannot place the cursor in any of the "stacked" text boxes. The other "non stacked" fields work fine. Any suggestions?