Totara 2.4.2 is a "snapshot" release containing bug fixes.
Here's the changelog:
Release 2.4.2 (28th May 2013):
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New features:
T-10625 Add activity filters to the main calendar
Improvements:
T-7702 Hide components from record of learning if they are not relevant to users
T-10742 Add module requirements to completion progress details page
T-10773 Add badges block to the course page
T-10764 Update jQuery and jQuery UI
T-10750 Add the columns manager firstname and lastname to the base source in Report Builder
T-10749 New date finished column in Facetoface reports
Database Upgrades:
T-10782 Fixed upgrade from Moodle 2.4.4
T-10776 Fixed badgeid foreign key on badge_manual_award table
Bug Fixes:
T-5734 Fixed undefined variable warning in Report Builder
T-6710 Fixed hardcoded competency language strings
T-10511 Fixed breadcrumbs in templates in Learning plans
T-10778 Fixed MSSQL distinct ntext problem in Program Management cron
T-10521 Stay on page when toggling blocks editing in Audience Management
T-10752 Fixed multilang filters issues in course, program, plan, and template names
T-10621 Fixed internationalisation problem with pre-defined rooms in Facetoface
T-10763 Allow upgrade to continue after errors when updating language packs
T-10679 Fixed error in types with names longer than 255 characters in hierarchies
T-10775 Fixed display of speech bubbles in Chat module for IE7
T-10771 Missing library error when cancel course restore
T-10774 Fixed filepicker layout in IE7
T-10740 Fixed deletion of program assignments from audience tab
T-10766 Hide positions from users without 'viewposition' capability
T-10415 Fixed "Clear incorrect responses" option in Quiz
T-10640 Added warning to messaging system
T-10754 Fixed ampersands breaking filenames in scorm reports
T-10761 Fixed hardcoded language string in program breadcrumbs
T-10696 Stay on course/program category page when toggling blocks editing
T-10629 Show user profile link when viewing course blogs
T-10531 Fixed undefined variable in Learning plans
T-10437 Fixed the message about users awaiting approval in Facetoface
T-10717 Remove extra addlog() when creating user in Totara Sync
T-10753 Fixed RTL issues on checkbox and text field combination
T-10760 Added enclosure for fields with spaces and commas when exporting report in CSV
T-10616 Make Factoface links style consistent with other links on course page
T-10682 Show evidence type name in Evidence Record of Learning report
T-10755 Remove unused code from Facetoface
T-10585 Fixed help text typos in Learning Plans
T-10538 Fixed undefined variable in Learning Plans