Blender file got weird

He guys,

I got some problem with a blender file that have been working on.
I started with it in blender 2.66 and did some work in blender 2.67.
But now my objects i create are shattered and some of my existing objects act strangely.
The strange part is that it acts like the backfase culling is on, but it isn’t.

Can somebody tell my what the problem is.


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