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If you suspect Vray, then probably the best place to seek an answer is chaos group forum.
Couple days ago I worked with AutoCAD and I had the same issues with viewport visualization, so Vray is not the problem . Thanks for the reply, anyways :D
If it happens across different softwares, then first thing you should check, is the graphic drivers. Update to the latest version. If that doesn't help, try tocompletely wipe out old drivers and do a fresh install.