Wow! In Beta 651 it works like a charm and even auto-migrates accordingly to layout variants between two masters. I am really impressed, it appears close to "Smart Master Pages" without their need of manually named layers and resources! master replace existing w pict-frms_beta651.m4v (NOTE: Since the beta usually handles former file versions as well, one should know that it seems not to work in this case: If I use my .afpub from v183 then beta 651 causes exactly the same issues. So,