Thanks to one and all who responded with advice. My Building Blocks.dotx was corrupted and it has been fixed.

I have one more issue to resolve, I like using the format of Page i of ix in section break 2 and Page 1 of 120 in section break 3; but Number of pages field obtain from Quick Parts counts all section pages so that I have Page i of 120. I need help in removing the "Same as Previous" at the start of each Section break. TIA