Totara 2.2.4 is a "security" release, because it includes important fixes from the latest release of Moodle (Moodle 2.2.5). We recommend upgrading your site to this release. Here's the changelog:

Release 2.2.4 (12 September 2012):
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Security fixes:
                Fixes from MoodleHQ http://docs.moodle.org/dev/Moodle_2.2.5_release_notes

Improvements:
    T-9804      Improvements to Arabic, Chinese, Dutch, Finnish, French, German, Hebrew, Hungarian, Italian, Japanese,
                Polish, Portuguese (Brazilian), Spanish (Castilian), Spanish (International), Swedish and Thai language packs
    T-9931      Add "course visibility" column and filter to Report Builder

Bug fixes:
    T-9924      Fix bug when optional Learning Plan objective due date is not set
    T-9822      Fix empty Quicklinks after fresh install
    T-9712      Fix notification types and language string in Plan objective/priority scales
    T-9739      Remove the change course button from recurring courses in Programs
    T-9842      Fix problem with icons being miniaturised
    T-9916      Fix Filters Tab form actions (delete, advanced etc) in Report Builder
    T-9936      Fix file handling bug in webdav repository
    T-9912      Fix MSSQL truncating table error in totara sync
    T-9890      Fix event triggers for Program user assignments when completion based on time from first login

Simon