Totara 2.4.16.1 is an "emergency" release, being released ahead of schedule because it includes an important fix for an issue introduced in 2.4.16 that breaks the display of hierarchy items (organisations, positions, and competencies).
Anyone on 2.4.16 is advised to upgrade to this release immediately, and if you are still on a lower version you should bypass 2.4.16 and upgrade directly to 2.4.16.1 instead.
Here's the 2.4.16.1 Changelog:
Release 2.4.16.1 (3rd February 2014): ================================================== Bug Fixes: T-11779 Fixed issue where hierarchies were not displayed properly T-10159 Fixed course completion to be enabled by default on new Totara installs T-11764 Fixed string and multilang filtering of customfield and report filter names in Reportbuilder MDL-43621 Fixed badges display to remove badges earned by deleted users