This is a bugfix release. # Broker * Fix possible memory leak when using a topic that has a leading slash. Fixes bug #1360985. * Fix saving persistent database on Windows. * Temporarily disable ACL checks on subscriptions when using MQTT v3.1.1. This is due to the complexity of checking wildcard ACLs against wildcard subscriptions. This does not have a negative impact on security because checks are still made before a message is sent to a client. Fixes bug #1374291. * When using -v and the broker receives a SIGHUP, verbose logging was being disabled. This has been fixed. # Client library * Fix mutex being incorrectly passed by value. Fixes bug #1373785.