I built a document in InDesign 5.5 yesterday (the first after upgrading), and had placed several objects and created text boxes in the document. When I opened it up today to make changes, I am unable to select anything on the page. None of the tools allow me to edit any objects, move them or make any adjustments. There is only 1 layer and it's not locked, and I can't choose any options to lock or unlock objects. What's going on? I've never had this problem in CS4.
Sounds to me like you were working on a master page.
Aha! Thank you!