Sometimes a custom group you've just created doesn't want to show up when you pull up the list of custom groups when creating objectives. If you just made the group, try clicking "create custom group," open up your group, and re-save it.
If your "custom" group is made up of standard enemies, edited or not, you can't use them for objectives. You have to use the enemy from the standard group, and re-edit them.
Annoying? Yes.
Eva Destruction AR/Fire/Munitions Blaster
Darkfire Avenger DM/SD/Body Scrapper
Arc ID#161629 Freaks, Geeks, and Men in Black
Arc ID#431270 Until the End of the World
More-or-less what it says on the tin. I can't use the custom mob I have set as the main Enemy Group for captives.
Any help?