Totara 2.2.18 is a "snapshot" release containing bug fixes.

Here's the 2.2.18 changelog:

Release 2.2.18 (7th May 2013):

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New features:

T-9460 Add learning plan report source 

Improvements:

T-10713 Move changelog into PHP file to prevent version identification via the web

T-10193 Set minimum width on tinymce editors

T-10117 Make Totara sync more verbose while running

T-10316 Show warning message if session is overbooked

T-10573 Allow embedding media in program summary and endnote

T-10702 Show email next to user name when enrolling individuals

T-10408 Add clear Totara Sync log functionality

T-10662 Add firstaccess column to a user report source 

Database Upgrades:

T-10471 Migrate issued certificates when upgrading to 2.2 

Bug Fixes:

T-10373 Redirect to courses page if unable to enrol in a course

T-10380 Fix status completion required when updating scorm

T-10628 Fix undefined variable errors in Messaging settings

T-10403 Fix hierarchy custom text and file fields Postgres error

T-10637 Hide audience functionality in courses from users without permissions

T-10463 Fix formatting in Site Log report export

T-10461 Fix Course Completion report export

T-10352 Set correct user in createdby field of signup status updates

T-10617 Fix corrupted site logs excel export

T-10277 Fix the amount of days in a year in programs

T-9446 Fix facetoface sessions duration output

T-10416 Fix rules issues in cloned audiences

T-10361 Show sidebar on Learning plan template component tab

T-10574 Fix display of images in program description

T-10626 Ensure report builder handles checkbox custom field default