hi there max,
yep, i think i get what you mean. when you created your ITEM DETAIL profile, (dumb question) did you save it and name it? then, when you created your MASTER profile, you should have chosen 1 each of ITEM DETAILS, CHECKOUT, ETC...
i just created a 'TEST' item detail and created a dummy listing and it worked just fine for me.
why don't you try this, instead of the 'MASTER' profile that includes all the parts, just manually "choose" the parts (ITEM DETAIL, CHECKOUT, MARKETING, ETC) from the drop-down menu's at the top/right of every section in your listings.
for example, at the top/right of each "section" there is a drop-down menu where you can choose your profile parts from instead of using the same master profile. have you tried loading the ITEM DETAIL profile seperately when creating your listing and then just choosing each appropriate profile section?
understand? let me know
thanks, kathleen