Totara 2.2.28 is a "security" release, because it includes a fix for potential security vulnerabilities. We recommend upgrading your site to this release.
Here's the changelog:
Release 2.2.28 (22nd April 2014):
==================================================
Security Fixes:
T-11998 Remove security-risk YUI libraries that are no longer used
Bug Fixes:
T-10315 Fix msgtype field when adding new messages
T-11625 Fix for mod/certificates upgrade error on upgrade from 1.1 where there are many certificates issued
T-12159 Fix link to Release Notes forum on Notifications page
T-11934 Fix 'page not found' exception when marking courses as complete via RPL
T-11953 Fix issue with Program Completion rule in dynamic Audiences
T-11958 Fix all completion duration rules in Audiences
T-11799 Fix completion logic error when using grade and status in SCORM activities
T-11946 Fix SCORM modules not launching in review mode correctly
T-12103 Fix libxml errors when adding a SCORM package