When you edit Master Page items on a Layout page in QuarkXPress, the link back to the Master is broken.
To avoid doing this accidentally, lock the Default layer and then add new layers for your page items.
Locking the Default layer effectively locks all the Master Page items.
Jay Nelson is the editorial director of PlanetQuark.com, and the editor and publisher of Design Tools Monthly. He’s also the author of the QuarkXPress 8 and QuarkXPress 7 training titles at Lynda.com, as well as the training videos Quark includes in the box with QuarkXPress 7 . In addition, Jay writes regularly for Macworld and Photoshop User magazines and speaks at industry events.