Totara 2.4.18 is a "security" release, because it includes important fixes for potential security vulnerabilities. We recommend upgrading your site to this release.

Here's the changelog:

Release 2.4.18 (11th March 2014):
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Security Fixes:
    MoodleHQ   http://docs.moodle.org/dev/Moodle_2.4.9_release_notes

Improvements:
    T-11596    Added a capability to filter by some default fields in the Facetoface calendar
    T-11828    Avoided ajax call when changing rules in Audience that use radiobuttons
    T-11104    Improved user experience by disabling 'Remove users' when 'Source contains all records' is set to 'No' in Totara Sync

Bug Fixes:
    T-10473    Fixed issues with scheduled report builder reports timing when sending across multiple timezones
    T-11817    Fixed the 'Unlock completion criteria' option deleting RPL completion records
    T-11838    Fixed position start date rule in dynamic Audiences
    T-11344    Fixed RPL not marking activities as complete
    T-11849    Fixed Facetoface notifications being sent to all booked recipients when 'No shows only' option is selected
    T-11471    Fixed emails being re-sent while upgrading from Totara 2.2 to Totara 2.4
    T-11869    Fixed parameter validation for tm_message_send in Messaging
    T-11665    Tasks and alerts blocks now respect the "show blocks when empty" setting
    T-11863    Fixed Facetoface notifications not being sent to managers when users choose not to receive notification
    T-11308    Made extra-field aliases unique to avoid name collisions in Report Builder
    T-11875    Fixed program assignment completion relative to first login
    T-11843    Fixed the wrong date being set in the firstaccess field when users first log in
    T-11857    Fixed Facetoface notification templates not saving 'Manager copy' and 'Status' values
    T-11797    Fixed nullability of positionid field in prog_pos_assignment to prevent errors on upgrade from 1.1 to 2.2
    T-11832    Fixed Program Completion 'Set time relative to event' option not saving different instances of the same event
    T-11677    Ensure parent page refresh to start completion checks when SCORM opens as popup
    T-11848    Fixed Facetoface room bookings when one session finishes and another starts at the same time