You seem to have nailed the behavior exactly, and that's the way it works.
In short, I think the problem is that when my pages are being switched to the opposite side of the spread it is adding the master objects of the side of the spread it switched to. So would there be a way to prevent that from happening?
That is correct behavior. You could stop using master page objects. Instead, make your anchored frames into a snippet or a library object so that you can drag and drop the thing onto a fresh page for that next arriving ad. I would make the master pages show only grid lines and margin and column guides.
If in CS6, and you are on the master pages, and you designate the selected frame as Primary Text frame, then that might not happen (if I understand your description, which I sorta don't)
Thanks Peter (I hope that comment wasn't tongue in cheek )
Michael, the reason I'm using text boxes on the master page is because all the ads are going to be in the same positions on the page and its much easier to have the text box in the right place every time withthout having to cut and paste anything or dragging snippets onto the layout every time I add a page.
I'm not sure that the primary text frame option would work because there is no official hierarchy to the ads on the page and also, I'm not threading my text boxes because each ad requires its own formatting and I also need to keep moving them around to keep the ad in alphabetical order.
Thanks for the ideas guys.
What format are the ads? Do you make them, or are they submitted as some sort of object?
My inclination would be to lose the master frames and set up a grid of guides instead so you can drag ads around and snap to the guides. I'd make every ad a single object of some sort -- PDF, or a single page from a .indd file sized the same as the ad -- no text frames at all. Do you do any sort of indexing of these ads that requires text tagging?
The ads are just text thats being sent to me in word docs and I'm copying and pasting them and formatting them to match the theme of the campaign. I don't think making each ad into a link is the way to go this time.
I noticed that sometimes the after deleting the new master page object that appears, when the page get shuffled, the master object wont reappear. I'm not sure if I'm right about this but if I am, at least I'll only have to remove the xtra anchored object once. unless I want to use the option of giving those text boxes a solid background on the master page.
Let me know if you think of something else. Thanks for your help guys!