Heal and Shield bug.
Seriously, this is a game breaking bug for me. Sedna or Queen will just stand still and do jack @!*(& instead of healing or shield 1/3 of the time. To add to, its hard to pick someone out to heal in the middle of huge fight so i often end up healing the wrong unit. Stardock, just add selectable team healthbars to the game already and fix this bug. It makes me say naughty words.