I have been having this issue in both Revit Architecture 2012 and 2013. I have loaded in my parameters for my title blocks ("Addition", "City, State, Zip", "Address", and "Lot#/Block#) in the same way I have done it in any other project. but for some reason in this project after I have loaded in my parameters and set them to my sheets and I am still not able to select them and edit them on my sheets. I have attached my file if anyone could help me figure out why this is happening it would be greatly appreciated! I have been trying to figure this out for months!