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The Form Controller module has been changed to the Form module. If you have Form controller, disable and uninstall it, then enable the Form module. No settings should be lost because of this module change.
The module now fully follows the standard for default tabification in Drupal 7 core. In the last beta, all fieldsets were tabified by default on an opt-out basis (new fieldsets were tabified). Now, fieldsets are tabified by default on an opt-in basis, unless the fieldset has a #group value defined (so new fieldsets without a #group value are not tabified).
Note that the settings set using the Form module will always override the defaults. If you think a module's fieldset should be tabbed by default, file an issue in the respective module's issue queue and point them to http://drupal.org/handbook/modules/vertical-tabs for the implementation details.
I'm also debating adding an option for 'tabify new fieldsets by default' in the next beta if you prefer new fieldsets on forms to be tabified by default.
This version significantly improves compatibility between different browsers and improves the overall display of Vertical Tabs. It features a complete backport of the CSS and HTML used in Drupal 7 core (Vertical Tabs is in core!) which has had extensive testing by the greater Drupal community. Also fixes display issues with Location and Date module fieldsets.