SharePoint Designer, Master Pages and Versions = Headache
How can something so simple can so much pain? Scenario: You open Designer to edit your page. When it finishes loading the Design view says Master Page is invalid and you need to fix it so you can see your page. So you follow the instructions and try to reconnect to the Master Page. Nothing works. Resolution: If your Master Page has not been published and you have the security level to see minor drafts, then you will be effected by this. You have to publish a Major verison to get your page to show correctly. Key is don't allow Minor versions!