Although the usual way to print an entire page of the same label would be to
use the option I mentioned, your problem is doubtless caused either by a
problem with the printer driver or (as Terry suggested) something in
Normal.dot. If you have ever added a header to Normal.dot, then the empty
paragraph that remains may be causing your problem. This, however, would
cause the first row of labels to start too low on the page. If that is the
problem (and I don't think it is), in your label document, try setting the
header margin to 0". But if labels are just spreading out gradually down the
page, then this could be a printer feed issue.