Missing dynamic field in form

Some quick background info: We have a site that allows users to sign up for driving school classes. We have a number of classes open for registration at any time. Every class has its own registration page, or, more accurately, post, that requests the student’s information.

We’re now having a problem where the classroom start date isn’t appearing on the page or the confirmation email. This is the tag that refers to the start date:

[dynamictext dynamicname uneditable “CF7_get_post_var key=’title'”]

As you can see from the link, that field is just missing.

One thing I’ve noticed in the Contact Form DB is that where the date’s stopping showing up, the “_wpcf7_container_post” number started showing up in the database. We have a number of different locations and, for the other locations, both “dynamicname” and the “_wpcf7_container_post” appear in the database. And those locations haven’t had problems with missing titles.

One other thing to note: the problem isn’t with the individual posts. People who have registered earlier saw the “dynamicname” on the registration (and we saw the “dynamicname” in the confirmation email). Something happened on March 4 to cause the problem.

Anybody have an idea what the problem might be and what the solution is?

Thanks!

The page I need help with: [log in to see the link]