Is possible that the steps of the wizard are dynamic? For example, the second step occur repeatedly n times?
I had the same issue, and the form wizard (even in Django 1.4) just didn't work for me. It was so much customization that some things started to go wrong and debugging was awful.
I did write some code based on the existing clases. Please see my gists where I posted a solutions that worked great for me. If you have any comments or suggestions (including the name of the class), please post them.
Multi-page form manager, arranged as a (math) graph, with dynamic paths (next form depends on actual state and user input) and number of forms. Storage and validation are handled. Based in Django-1.4's django.contrib.formtools.wizard.views.SessionWizardView. https://gist.github.com/3098817
django.contrib.formtools.wizard.views.SessionWizardView
Custom Django SessionStorage. Removed all the functionality that dealt with files. Based on Django-1.4's django.contrib.formtools.wizard.storage.base.BaseStorageand django.contrib.formtools.wizard.storage.session.SessionStorage. https://gist.github.com/3080251
django.contrib.formtools.wizard.storage.base.BaseStorage
django.contrib.formtools.wizard.storage.session.SessionStorage
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