During the initial start of a jump of my Stormboyz in a match with a friend, they were hit by a stun and the abilities became unselectable.
Unfortunately, after the duration of the effects wore off, the abilities remained stuck in a non-selectable state.
My stormboyz were now grounded indefinitely until death and respawn..
(I will also note, a drop pod full of scouts were dropped on some stairs and the scouts could not move.. They held their ground until death minutes later.)