Strange graphics glitch when working with very small units(milimeters) It all works nicely until one point, then everything looks like on the image (both in edit and object mode). Even when I save and reopen the file. :S
The issue is that you set the clip range to a very large value:



By setting the end clip to such a large value you are loosing precision. Blender can no longer resolve geometry that is close to each other. The issue is called Z-fighting, the same as when you have geometry that is occupying the same space in the scene (This happens in all 3D software not only in blender). As a rule your start and end clip settings should be so that they encompass your scene, but not a lot more. Why would you need to set the end distance to trillions of Km when you are working with objects are a few centimeters long?