Please refer to my above post:
 
   
And the L1 MIS Starter pieces get the dreaded sinkhole bug if there's any terrain distortion whatsoever.
 
 
 
EDIT:
 

 

Broken. Horribly broken.
 
 
 

 

How am I supposed to build a Roundabout Interchange if the MIS doesn't connect? Where are the Filler pieces? There used to be filler pieces. Where are they?
 

How could this happen?
  - MOD EDIT: Moved to central bug tracker topic MandelSoft