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AutoCAD Based Opening a Drawing (Ribbon/Toolbar/Location)
Description:
Drawing looks strange, piping looks hollow and sprinkler heads a little off and Acad background looks greyish/grayish.
Drawing also seems to lag when panning, processes take longer
The visual style has been changed, to something other than Wireframe
Change your view to 2D WIREFRAME
Or go to the menu [View|Visual Styles|2D Wireframe]