It's Tuesday, so it's computer class day. Today the students kept losing the white space at the top of their document. Problems in classes I find are like Mexican Waves. Once someone starts they spread round the class.
It's easy to lose the white space at the top of your document in Word 2003 or 2007. Suddenly your text appears to have jumped to the top of the page and you seem to have lost the top margin. You haven't lost the margin - it's still there, and will be there if you print the document. It just isn't showing on the screen. You have accidentally hidden the white space at the top of the document. Head on over to my website for an illustrated guide to turning the white space back on again.