Today's I have pushed a further update in the beta branch. I think this now all ready for moving into the stable branch but really appreciate your help in testing this! If you spot anything just file it using the in game form.
Build 311:
-cannot reduce a track over a fence if a fence is on the platform
-cannot extend a track beyond floor on lower level (as impossible non contiguous track)
-improved tiling and retiling processes when editing track length
-fix a few outstanding crashes on track edits
-fix potential crash if staff sit on sofa while moving it in same step
-fix potential crash if dead rat finds itself on no ground and creates gas
-fixed crash introduced in v310 building various objects/entrances