New document (picked Letter, landscape). Page appeared. Chose File...Spread setup... Chose Margins. Pressed 'pick from printer' which changed one of my margins. Pressed OK. NO CHANGE in the blue outline for the margin. Tried a second time. Same result. Quit. Restarted. New document (picked Letter, portrait). Went to File...Spread setup. Chose Margins again. Pressed 'pick from printer' which changed one of my margin values, just like before. Pressed OK. NO CHANGE. Went back into Spread setup and manually typed in a new value. Pressed OK. CHANGED! This method worked. Please check the 'pick from printer' function and write statement when OK is pressed immediately after.