I am using QGIS 1.8.0 Lisboa. I am making a print composer map that displays the grid lines as reference for the coordinates. But it doesnt display anything (gridlines) on the print composer map. The map is there. But no grid.
Have you set the x and y grid interval? By default the interval is set to 0, which results in no grid lines shown. You'll need to manually set them both to the desired values before a grid will display.