Reply To: How do I delete a page without ID reapplying master pages to moved pages?

This is how it has always been (with InDesign and QuarkXPress). I assume you have a facing pages document… so when you remove (or add!) an odd number of pages, the left hand pages turn into right hand pages, and vice versa… therefore, the master page has to be reapplied. It's always better to add or remove an even number of pages.

There are ways to manage this a little better… I think AutoFlow from In-Tools.com can help you manage the pages a bit more.