While we are talking about Master Layouts, let me note that there are some Preferences Changes in AC13 related to Master Layouts.
One is that now one can define for each Master Layout whether its content should be above or below Layouts. Earlier this was a Global setting for all Master Layouts.
The Layouts page of the Project Preferences Dialog is gone, and the other two options that were there have gone to the More Options and On-Screen Options pages of the Work Environment Dialog.
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