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This update requires you to make changes to the following files:

• /Web.config
• /App_Config/Include/Sitecore.MvcExperienceEditor.config.disabled (default name)

The clean config files for Sitecore CMS and DMS 6.6.0 rev. 121015 can be downloaded using the following links:

• Sitecore CMS 6.6.0 rev. 121015 Web.config file 
• Sitecore.MvcExperienceEditor.config.disabled 

Changes to the Web.config file

The following changes have been made to the Web.config file of Sitecore CMS 6.6.0 rev. 121015 (Update-1) as compared to the Web.config file of Sitecore CMS 6.0.0 rev. 120918 (Initial Release):

1. In the <pipelines> section, add a new pipeline <hasPresentation>
   <!-- Checks if item has presentation assigned. Is used to define whether item can be opened in Preview or Edit mode. -->
   <hasPresentation>
     <processor type="Sitecore.Pipelines.HasPresentation.CheckLayout, Sitecore.Kernel" />
   </hasPresentation>
   

The following steps are related to issues merged from 6.5 Update-6, so you do not need to make these changes if your solution was upgraded to CMS 6.6 from 6.5 Update-6 or later (but you should still update the other 6.6 configuration files as described later in this document):

2. In the <settings> section, add the following setting:
   <!--  ITEM PATHS CACHE SIZE
         Determines the default size of the item paths cache of a database
         Specify the value in bytes or append the value with KB, MB or GB
   -->
   <setting name="Caching.DefaultItemPathsCacheSize" value="10MB"/>
   
3. For each defined database sections (core, master and web) locate the following section:
   <cacheSizes hint="setting">
     <data>20MB</data>
     <items>10MB</items>
     <paths>500KB</paths>
     <standardValues>500KB</standardValues>
   </cacheSizes>
   
   In this section, insert an <itempaths> node (default value: 10MB) and repeat for all your Sitecore databases:
   
   <cacheSizes hint="setting">
     <data>20MB</data>
     <items>10MB</items>
     <paths>500KB</paths>
     <itempaths>10MB</itempaths>
     <standardValues>500KB</standardValues>
   </cacheSizes>
   

Changes to the Sitecore.MvcExperienceEditor.config.disabled file

Notice: If you have enabled Sitecore MVC, this file will be named Sitecore.MvcExperienceEditor.config.

Tip: Most customers have not made any changes to the Sitecore.MvcExperienceEditor.config.disabled file. In that case, we strongly recommend that you simply download the clean config file using the link above.

The following changes have been made to the Sitecore.MvcExperienceEditor.config.disabled file of Sitecore CMS 6.6.0 rev. 121015 (Update-1) as compared to the Sitecore.MvcExperienceEditor.config.disabled file of Sitecore CMS 6.6.0 rev. 120918 (Initial Release):

1. In the <pipelines> section, add a new pipeline <hasPresentation>:
   <hasPresentation>
     <processor type="Sitecore.Mvc.ExperienceEditor.Pipelines.HasPresentation.CheckController, Sitecore.Mvc.ExperienceEditor"/>
   </hasPresentation>