Can not add city in manage >> system??
Till version 2.2
There is a bug when you add a city like san diago , it will not be able to add it.
It has been fixed!
To fix it goto manage/system/city.php
Line 11
$cityname = preg_split('/[\s,]+/', $_POST['hotcity'], -1, PREG_SPLIT_NO_EMPTY);
Replace it with
$cityname = preg_split('/[,]+/', $_POST['hotcity'], -1, PREG_SPLIT_NO_EMPTY);
And you are done.
Thanks