I think I found a bug on Mission 1. I'm at the part where a sick diplomat enters, but he refuses to be healed. He just wonders around aimlessly. I already built the sickbay and hired a Gray Alien, but he refuses to go inside the sickbay. I created a door, diagnostic unit, and couch, but for some reason both the Gray Alien and the Sick Diplomat refuse to enter. What else do I need to do so I can continue the mission?

Update:
I think I figured out the problem. It looks like you have to keep the doors of the facilities facing south or the aliens cannot enter them properly.