Can't show or hide fields in submission on page

I used the form slug “guestbook” and I added it to the page with the following code:

[form guestbook]

Works fine.

Then I added the code to sumbit data to the page, but I only want certain data to be published. I assigned nicknames. Then so I added:

[formdata guestbook show=”lastname”]

But it does nothing ?? I tried removing quotes and it didn’t work either. When I tried doing hide instead:

[formdata guestbook hide=”email,lastname”]

It didn’t work either. Is this broken or am I doing something wrong? I do not want people’s ip addresses and other fields to be posted, but I do want some of them. HELP!