This morning my 3.6.1 RC1 engine refuses to start. Looking at the logs I see:

2015-12-01 06:27:55,611 ERROR [org.ovirt.engine.core.dal.dbbroker.generic.DBConfigUtils] (ServerService Thread Pool -- 43) [] Error parsing option 'AutoRecoveryAllowedTypes' value: org.codehaus.jackson.JsonParse

Exception: Unexpected character ('\' (code 92)): was expecting double-quote to start field name

 at [Source: java.io.StringReader@3198de41; line: 1, column: 3]

Is it a tracked issue? Do you need logs? I still have the engine instance if you want to inspect.