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    By Justin Doughty 

    When working with lots of viewports on multiple layouts in AutoCAD, users can run into a problem when they create a viewport, and it

    disables or turns off a previous viewport, making its contents disappear.

    This is usually solved by setting the MAXACTVP system variable to a higher number. This sets the maximum number of active viewports allowed in AutoCAD. The maximum is 64.