I've uploaded and image with 2 screenshots.  This is a perfect example of what's going on - the one WITH alternate lines shaded was saved several months back on the EXACT same PC/Software.  Now I resaved the same invoice and you see there is no line shading.  I looked under printer options, (even though saving isn't printing technically) and there is no checkbox to enable or disable "Shade Alternate Table Rows".  I don't remember if there was before, but that has to be what is wrong and I hate to say this but I believe that was intentionally removed from this software via an update.  WHICH would be absolutely wrong of Intuit to do to their customers.