[Zope] backbutton and form selections

I just migrated from Zope 2.3.2 on NT to Zope 2.7 on Win2k. I have a lot of pages where many selections are made (checkboxes) and then submitted to use a SQL method and create a report. On the old setup, hitting the back button would take me back to the form page with all the form selections/de-selections remembered. Now, this works with Mozilla but no longer with IE ? Any ideas?