Custom Group Types not filterable
On Manage groups, you can filter the group list by group type (e.g. Mailing List, Access Control). If you add an additional group type (add value to the respective option group). that works fine when managing groups (i.e. you can save the record with the custom group), but although the option is displayed in manage groups, the filter does not work. there must be some hardcoding for that filter field.
Currently, the custom group type is available to choose as filter in 'Manage Group' but doesn't filter the list of groups. Fix the code to allow filtering of groups on basis of custom group type.