Tutorial bug? Sight doors are open, but then close. can't reopen

[Evil.Bonsai]

Folling the missile tutorial, I click the observ switch, then  LAlt+A to move to view. Can see red smoke and a red arrow, but then sight doors close, image goes blank with OPEN SIGHT DOORS in yellow, but I can't seem to open sight doors. Repeated runs of tutorial all do the same thing.