This issue only applies for stations and planet plates.
# enter a build block on a station/planet
# fly your build mode camera in a random direction for a few seconds
# press escape
# press "resume" or escape
You'll notice that your build mode camera is back at the position your astronaut was in before he entered that build block. Your position is also stuck although you can still look around.
You can easily fix this by opening and closing your escape menu again. This brings you back to your original build mode position.