After creating a structural floor, I tried to edit it and the command (Edit boundary) is not allowing me to save it. What do I need to do in order to save revised layouts? The "X" and "Check" options are not showing.
Are you working in the 2012 or 2013 release of Revit Architecture? Has .NET 4.5 been installed on your computer? (One way - installing the 2014 or 2015 release of Revit.) If so, the issues that causes with the ribbon (including contextual tabs/panels not displaying when they should) can be fixed by applying a hot fix for the 2012 release (after applying Update Release 2, if not already in place) or by applying Update Release 3 for 2013. Links to the updates can be found in this blog article.