Your description is a little hard to follow, but I think I've got the gist. New items added to the master page should show on all pages to which the master is applied, but if you've overridden other objects on the live pages and they overlap the new object, they are going to be in front of it on the live page, even if they are behind it on the master.
On any given layer, all master objects are behind all objects on the document page. if you have a situation wher you need a master object in front of a live object, add a layer and move it to the higher layer. Give that a try and see if it solves your problem.
And a general bit of advice. If an object is being overridden from the master page you need a REALLY good reason for it to have been on the master page to begin with. The whole point of master objects is they generally don't change, or if the do, they need to change everywhere. Perhaps you need more than one master, built in a "based on" heirarchy, so that you can edit a master object for a group of pages at a time.
Hey Peter, your layer suggestion did the trick. I was unaware that items would always stay up front even if they don't appear that way on the master page. And I agree with you about not putting something on the master if it's going to be overwritten - but most of the time it's copy or color that I'm changing and in a large document with multiple pages where some change and some don't it seems to work out. If you saw the document this would make more sense than my ramblings.. Lol. Thanks for the help!