Saving postscript files with the separations option

I am testing Adobe Acrobat XI. We used to separte our clients pdf files as followed.

file - save as - postscript file - advanced options - ... separations cropmarks etc.

if you open this file i  acrobat you get all your desired printingplates. this stoped working in Acrobat XI on al computers in the office

Mac Os = Lion and Mountain Lion

al systems give the same error in Distiller.

%%[ Error: undefined; OffendingCommand: Adobe_AGM_OnHost_Seps ]%%

Older postscript files that are created with acrobat 9 work fine.

So i am guessing it is An acrobat problem

thanx

Bert