Text box outlines on estimates QB desktop

It sounds like your printer setup for Estimates is set to print on pre-printed forms.

To check, go to File | Printer Setup  and then pick Estimate. Is the Intuit Preprinted Forms option selected? If not, is the Do not print lines... option selected?

Be sure you've selected Blank Paper or Letterhead, the options where lines will print, and that the Do not print lines... option is not selected and then it should work as expected.

this is happening in the invoice section 

OK...?

Last week the lines were on my printed invoices now they have disappeared 

I stayed on the phone with intuit and walked through same steps  I had already done-

Hopefully there is a setting that can be adjusted.