I don't know if this is a known exploit and if it is you can just ignore me. I found that if i'm on a ground map and then click to abort the mission my away team and i will beam away and then it'll come up with a choice of instances to join. If i then click cancel i don't reappear. I am there but i'm invisible and i can interact with everything. I can do the whole mission by killing everyone or just walking past them and they can't do nothing to me. Basically it's ground god mode and it needs sorting, like now.