Thanks for the suggestion. I tried toggling the Show/Hide Gridlines but
that changed nothing. I vaguely remember fooling around with the ---
key and somehow a horizontal line got generated.

The file is on line which is the way I save reedits. Please feel free
to look at it if by looking at it you can identify how the lines were
generated: http://charlesumlauf.com/instances.doc

TIA

Michael Eisenstadt