Thunderbird has suddenly decided that it will split the header and sender information of an email from the text message which means that if I try to print the whole message the header and sender information appears on the first page and the rest of the body of the text is on the following pages even if the message is only one page long. The message appears correctly when I view it it's only when I go into Print Preview that the separation shows and even if I reduce the margins or remove the header it still splits the first page. The Config Editor appears to be correct in terms of the height and width of the paper being A4. I'm not sure but I think the system was upgraded recently as this problem only started this week. Can anyone help me?