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Solved by CDuBois82560. Go to Solution.
Sorry, I don't know and I can't duplicate this here.
Does this happen occasionally or every time?
Take a look at this thread. Does this seem to be the same issue you are having?
http://forums.autodesk.com/t5/AutoCAD-2013-2014-2015/Deselect-in-viewports-when-panning/td-p/3618380
Is the problem file specific? Try setting HPMAXAREAS to zero.