I have tried numerous times to view auto cad drawings and cannot. I open an auto-cad drawing I can see nothing. I can find lines by hoovering the curser over them and then they high light but once of the line it is gone. It does not seem to matter how old or how new the drawing. I've tried changing layers, no good there either. Whatever I try does not seem to work. I need help. I have a project right now where I will need to update some auto cad drawings but can't

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