Help...I used Liquid Layout then Alternate Layouts to take my documents and convert from Letter (8.5" x 11") to a vertical A4 for European use.
When I eliminated the Letter pages to have a "clean" A4 file all the text boxes had a Brown Question Mark in the box.
What OS? What InDesign version? Where are you seeing the question mark?
Because you have "eliminated" the letter size pages you broke the link between them and your layout in A4.