Do you have any firewall active that might be blocking the access to Apple's maps servers? If Wi-Fi is off, or anti-virus software or a firewall is blocking the connection to the location servers, you may only be seeing the grid:
Do you have any firewall active that might be blocking the access to Apple's maps servers? If Wi-Fi is off, or anti-virus software or a firewall is blocking the connection to the location servers, you may only be seeing the grid: