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When I try to select the faces of my sphere with C the selection slowly becomes random.
Furthermore, in solid view in edit mode, when adding a new cube, it looks like this picture, with all faces divided by triangles and strange borders!?!
It's a common problem, related with you driver of video. Enter in Blender User Preference CTRLALTU and try with different configurations, in Selection and Window Draw Method, to fix it.
The cause of your problem might be that you have set the number in the image below too low , try increasing it it may fix your problem. Hit N while your mouse is in 3d view to bring up those options
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