I recently installed edit flow on WordPress 3.3.1. The main difficulty I am having is that I am unable to add users to usergroups. I have tried adding a user to a group from the WordPress Users menu as well as the edit flow user groups menu. In both scenarios, I check the appropriate checkboxes next to the user or group. However, when I update the user group or update the user, the changes are not saved. Is there a common cause for this? Could it be something with my version of PHP?