Appearance Glitch in Inspector
I click on the Body Part to open a dialog, click on alternating colors to color every other row of my report.
Then I open the inspector for the last field in the report and shade the column, using the Appearance tab.
I did not like the way it looked, so I went back and unshaded it, but the alternating row color did not repaint over the last column. So now I have a color that paints across the row of fields, but breaks and does not paint over the last record.
Sounds like you have changed that field from transparent to a solid fill color that matches the background of the layout when no alternating color is applied. Use the pattern control to specify a transparent pattern and the back ground color will show through.