I have used previous releases of Design Review (2011,2012). In those I was able to have one .dwf file that I would export my revit sheets to, a project architect would mark up, I would import into Revit, and then re-export once I had addressed all changes and the markups would still be present. Now, with 2013, When I re-export, It says the mark ups are not editable and I cannot add anything new. I am wondering if this is a problem with the software or am I missing a step.
My resolution to this back in January was to download the latest revit service pack. It fixed most of my issues. I still have some problems periodically where my markups turn into dummy objects but it has worked pretty well so far. Hoping things go well in the 2014 upgrade.