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):
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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