Can't sign signature fields in Adobe Reader XI

Question

Using Adobe Acrobat X (not the Pro edition!) Dutch (NL) Language Edition  I created a document with two signature fields. Afterwards I tried to save as "Reader Extended". (The only option I found under "Save As" that looked similar to this command in my Dutch language version was "Uitgebreide PDF Reader" (this means "Extended PDF Reader") and then "Formulieren inschakelen en opslaan in Adobe Acrobat".  This last option means literally "Enable forms and save in Adobe Acrobat".)
When I opened the document in Adobe Reader XI (Dutch version again), the two signature fields are clearly visable, but do nothing when I click on them.
I've Googled extensively and also read the other topics on this FAQ which deal with similar problems, but to no avail... Any ideas on what I am doing wrong?
Regards,
KVD

Answer 1

After doing more testing, the Page Open event works in Reader but is very slow updating the result page that has the code and uses the Page Open event.
In Acrobat happens instantly, but in Reader takes a loooong time, sometimes seems that doesn't even update, as it takes forever. Wonder if my Reader's settings are screwed up?
Basically you have two pages, page one with a 4-choice radio button and, page two with a text field to report the value of the selected button choice.
Page two has the following code as Page Opens:
     var buttonV = this.getField("Group1").value;
     getField("Text1").value = buttonV;