This extension provides Markdown formatting for fields. It is part of the Symphony core download package.
Format text using Markdown syntax. This release also passes any output through the HTML Purifier library.
Although the update should address this, fields that used a previous version (< 1.10) may appear to have no formatter specified and will need to be set manually.
Information about installing and updating extensions can be found in the Symphony documentation at http://getsymphony.com/learn/.