Be sure to turn off auto change bars before you print; they might be
getting restored in your printing process. Do a Generate/Update to see
if they reappear. If that doesn't help...
Put the cursor in a paragraph with the change bar problem and then look
in the Default Font pane of the Paragraph Designer. If the Change Bars
checkbox is checked or in the Don't Care state, uncheck it and click
Update All.
If the change bars might be associated with a character style, click in
text with the suspected character style and do the same in the Character
Designer.
Does that help? This is all from memory; I don't have Frame running now.
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Ron, the humblest guy in town