Printing with a single column print range will result in a corresponding second page being produced. This spurious page will display a series of row headers, or a vertical line if row headers have been deselected with the display command.
The workaround is to select two columns for the print range, then collapse the second column so it is hidden from view.
This issue occurs in every version of ClarisWorks 1.0 and is still under investigation. It may be related to the print driver selected.