Django just released a security update yesterday to their 1.2 line of the framework (Release Notes) that breaks compatibility with the AJAX portions of Formunculous. I hope to get patches and a compatible release out in the next week, but for now if you apply the Django update many features will fail to operate correctly if the CSRF middleware is enabled on 1.2 sites.
I am working on putting the final touches for a minor release—2.1.1. This release will have some minor CSS/style fixes, and most importantly, it will work better with the newly released Django 1.2.
Click on the title for workarounds, if you are having issues with Func and Django 1.2