Is there a way to find a certain master page using find/replace? I have a very long document and some master spreads are inserted where only the left or right master page is wanted. There is no unique text or object style on that master page to search for, so I can't use that method.
You see in the page panel which master page is applied. Don't use the same name multiple times, if it is so, rename the masters.
If you work with double sided documents, you have to set up your document as document with facing pages. Have you done so?