CS2D 
Room/Lighting issue in MapEditor? Solved here:
1 
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I have just been making a map, and after a while realised that all my lighting and rooms had disappeared, even though the entities themselves were still there.
I had previously enlarged the map through the tools(?) section of the mapEditor, and after half an hour I figured that was the problem, and I was right.
I am just basically reporting a bug, but also, so you don't have to spend time back tracking to find where your lighting went missing; just make the map a bit smaller and it will all come back.
Will~
Obviously Exactly Myself