Hi, what happens here : AECOsim SS5 - reinstalled today after the crash, the same result with SS4 win7 64bit eng Nvidea geforce GTX 660Ti latest driver (337.88) opening the drawing on another machine shows there is nothing wrong with the dgn file here : there is a "black hole" in the middle of the screen, and everything is pointing to the hole, moving the view: the hole stays in the middle (center) of the view, the lines are stil pointing to that point: opening a new drawing gives the same trouble. who can help Rik
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