Add in uniqueness to cache keys to mitigate clashes on multisite installs

CRM/Contact/BAO/Contact.php

@@ -1318,6 +1318,7 @@ WHERE     civicrm_contact.id = " . CRM_Utils_Type::escape($id, 'Integer');
     $cacheKeyString .= $showAll ? '_1' : '_0';
     $cacheKeyString .= $isProfile ? '_1' : '_0';
     $cacheKeyString .= $checkPermission ? '_1' : '_0';
+    $cacheKeyString .= '_' . CRM_Core_Config::domainID() . '_';
 
     $fields = CRM_Utils_Array::value($cacheKeyString, self::$_importableFields);
 

CRM/Core/BAO/CustomField.php

@@ -503,6 +503,7 @@ class CRM_Core_BAO_CustomField extends CRM_Core_DAO_CustomField {
     $cacheKey .= $onlyParent ? '_1_' : '_0_';
     $cacheKey .= $onlySubType ? '_1_' : '_0_';
     $cacheKey .= $checkPermission ? '_1_' : '_0_';
+    $cacheKey .= '_' . CRM_Core_Config::domainID() . '_';
 
     $cgTable = CRM_Core_DAO_CustomGroup::getTableName();
 

CRM/Core/BAO/Navigation.php

@@ -159,7 +159,7 @@ class CRM_Core_BAO_Navigation extends CRM_Core_DAO_Navigation {
    *   returns associated array
    */
   public static function getNavigationList() {
-    $cacheKeyString = "navigationList";
+    $cacheKeyString = "navigationList_" . CRM_Core_Config::domainID();
     $whereClause = '';
 
     $config = CRM_Core_Config::singleton();