If a thread node's name start with a "special" character (! or [ for example) which is turned into a - when saving the node, the query used in info.magnolia.module.forum.DefaultForumManager#getMessages (incidentally used in a ...template!yuck.) fails miserably, presumably because of that first hyphen.

Here's such a failing query, as generated by the criteria module:

//sandbox/-what-//*[( (jcr:primaryType='mgnl:message')  and  not( (@validated='false') )  )]  order by  @creationDate ascending

This simplified query fails the same way

//sandbox/-what-//*