Bug in 1.6.4.1.1? Second form not displaying when called from first form

Hi, still finding my way in the wealth of feature in Gravity!

After upgrading from version 1.6.3.3.4 to 1.6.4.1.1 suddenly the second form (?page_id=74) called from the fist form )Homepage) is no longer displayed. The seconde form is called using a redirect on the fitsr form (http://www.notulistenvereniniging.nl/??page_id=74 and passes field data via a quey string{Cursusdata en plaats:1}.

Here's a link to my site: http://www.notulistenvereniging.nl
And here's a screenshot of how the data on the second form should be displayed.
I'd be glad to provide you with a private guestlogin to my site.
I can't figure out what the cause might be?

Best wishes,
Jan

Hi Rob,
Sorry for the inconvenience. While waiting for your reply I went on testing to see if I could find out the cause problem myself. And in the cause of this I completely empitied my test site. When I started with the empty test site with gravity 1.6.4.1.1 the passing from form#1 to form#2 worked flawlessly.
This was not the case when I tested forms#1 and #2 developed under gravity 1.6.3.3.4. Then form#2 was not displayed.
At present I can't reproduce the problem anymore. But I'm still left wondering if the cause could have been some incompatability when using forms which pass parameters which were created under 1.6.3.3.4 and used under 1.6.4.1.1 i.e. in some cases no backward compatability between 1.6.4.1.1 and 1.6.3.3.4. But this is speculation on my part of course.
Best regards,
Jan

Jan, this is because your theme is running an older version of jQuery (1.5). Gravity Forms recent release relies on the latest version of jQuery (1.7.1) that ships with WordPress. This form also uses conditional logic and the recent release required us to make changes to how we handled conditional logic. You will need to make sure you are using the latest version of jQuery and that will solve your issue.

Screenshot