After upgrade to 4.7.23., icons do not show (Civicrm on WordPress) (SOLVED)
Following my comment - You need to provide existing path in the resource url and directories page. Click the help icon to see the values of diferent global variables that you can make use of(civicrm.files, etc). 

You can override these values in civicrm.setting.php file according to your paths. More info at https://civicrm.stackexchange.com/a/19498/245