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Is there a setting to make it so when in VPMAX, that objects that are annotative will hold the scale of the viewport? it makes it very hard to place objects utilizing vpmax... doesn't make sense that it would change scales in a locked viewport.
Annotative AutoCAD object (text,mleaders,blocks) shouldn't resize when you are using VPMAX. The Civil3d objects however will resize. Unfortunately, there isn't much you can do about it.
http://www.civil4d.com/2010/07/civil-3d-annotation-scaling-revisited/