Ran into a possible bug? Just found out about the Artemis but i can't get to the Arboretum. Any help? I found out about the golden gun, and for whatever reason the main lift is locked up. Unless i go the long way around the exterior and hope there's an open airlock, i can't get back to the Arboretum to find this damn body.

Main quest i'm on now is Reboot, a bit after Alex locked Deep Storage down. 

Am i screwed out of the Artemis because of a bug, or is the main lift supposed to be locked down AFTER i cleared it the first time? I really want this golden gun and maybe to do some other side quests, but if i'm locked out of the Arboretum, i'm going to be mad.