Display problems with .OBJ files

Hi everybody,
I load some .OBJ files with the objectfile loader, it works good, but when I look at the objects, there's some polygons error : the display is not really good. When I use the zoom, the polygons seems to move : I think that there is a problem of z-ordering, because sometimes polygons which are behind, pass over front polygons...
There's 2 links to see what I mean :
First, normal view, I don't do any moves with the mouse : http://mfrac10.free.fr/GIF/Capture1.jpg
Second, I rotate the model, and you can see that some hidden walls pass over others : http://mfrac10.free.fr/GIF/Capture2.jpg
If somebody knows about this kind of problem, it would be very great !
Thanks !

Thank for your answer and sorry for the pictures, but if I zoom in on the buildings, the display errors disappear...
The normals are not set properly, because those .obj files are from a .dxf where the normals are sometimes clockwised, sometimes anti-clockwised : the solution I use is on the .obj to enumerate points for a face on one way and on the other way (f 1 2 3 and f 3 2 1).
With the mouse, I rotate the view : I use a custom Behavior, at the beginning to have many views, but now it's the same file as the one from the API.
I repeat, but maybe it is important : when I am closed from an object, the default seems to disappear. It's when I go far from the objects that I see those defaults...

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Path:            /Applications/Adobe Photoshop CC 2014/Adobe Photoshop CC 2014.app/Contents/MacOS/Adobe Photoshop CC 2014
Identifier:      com.adobe.Photoshop
Version:         ???
Code Type:       X86-64 (Native)
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User ID:         501
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