I am using QGIS 2.4 in Mac OS 10.10 Yosemite. Just trying to produce a map with cartographic symbology in the print composer. Map data: polygon and line shapefiles projected in SAD69 / UTM zone 23S/ EPSG:29193, drawing scale 1:124,051. First, I add a new map on canvas and change map scale; thereafter, I try to create a grid from item properties, in the following order: I select the Show grid checkbox; then, I select cross option as the grid type; next, I change both X and Y interval to, say, 10.0000000. Here is the point: after changing Y interval, Mac OS spinning beach ball of death appears and QGIS stops responding. What am I doing wrong or skipping steps in the construction of the grid? Thanks in advance.