... And you're on Chernarus - I couldn't for the life of me figure out why my AI wasn't spawning. Should have turned debugging on first and I would have figured it out a lot quicker... 
The SAR_cfg_grid_chernarus.sqf in the 1.5 package looks to be a modified testing version (the grid is shrunk and up in the NW). Just change the values back or use the previous file. These values are working for me:
_startx=2500;
_starty=2800;
_gridsize_x=6;
_gridsize_y=6;
_gridwidth = 1000;
The SAR_cfg_grid_chernarus.sqf in the 1.5 package looks to be a modified testing version (the grid is shrunk and up in the NW). Just change the values back or use the previous file. These values are working for me:
_startx=2500;
_starty=2800;
_gridsize_x=6;
_gridsize_y=6;
_gridwidth = 1000;