Did you lock the layer?
No I did not lock the Layer. I did check that.
Did you expand the layer to be sure the text frame itself is not locked? Is the frame behind something else? Did you accidentally convert the text to outlines?
What's the OS? Can you create and work with text in a new frame? In a new file?
Boy, do I feel the fool. There was indeed a frame over the pages. I should have checked that.