After much playing, I've discovered that at some point (around the time of i12 release) something 'changed' which has caused my base to 'adjust' (ie. removing offending items) so that the base rule "Item blocking clear path between doors" can be satitfied.
Whereas I fully support this rule in base building I wonder what changed so that my base was auto-configured to remove all my hanging fixtures (and other other odds 'n sods) along my mazes 'correct' path? Rendering it pretty useless.
Says it all really - I have a huge maze in my base however many light fittings and bits seem to have 'disappeared', just wondered if this is a single problem or one more widespread?