Try creating a workflow, and assigning a work item to the relevant group.
Form Manager doesn't automatically show you every single group you're a member of, it only shows you those groups that have had a work item assigned to them. (This makes sense - you're probably a member of all sorts of LDAP groups that have nothing to do with workflow, and would just clutter up the Form Manager UI.)
Please let me know if this works (or if it doesn't).
Howard
http://www.avoka.com