Presto 3.8 and later contain significant changes and additions to the RAQL query syntax that you use in mashups. If you have mashups from Presto 3.7 or earlier, you must update the mashups that use RAQL queries to run on the new MashZone NextGen, but you might want to also update the other mashups to take advantage of new RAQL query syntax. For complete information, see the topic about migrating old RAQL queries to the new release in the MashZone NextGen User and Developer Guide.