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When we started working with 2012 64bit, there is no issue. After start sharing files with our team, we all are getting viewport issue. If we select some perticular object then it displays some objects with wireframe which are not in the scene. And if we pan or zoom in/out viewport then some lines are shown. Some time autocad plan also will visible. It appears in both wireframe and shaded mode. Please find the attached image. We are using ATI firepro v4800 graphics card. Please help me out this issue because our all shared files are getting affected by this.