I have been working in a lot of drawings and a large percentage of them have an annoying problem I've never ran into before. When I double-click over the viewport to check or modify the viwport scale, the double-clicking action not only activates the viewport, but it simultaneously zooms all objects to the extents of the viewport boundry. Because this is happening in some drawings and not in others, I am assuming there is a toggle or variable that turns it on or off. A quick search of the AutoCAD variable list did not produce anything that jumped out at me. Has anyone ran into this before and do you know which variable or fix will set it back?