Totara 2.2.17 is a "snapshot" release containing bug fixes.
Here's the 2.2.17 changelog:
Release 2.2.17 (11th April 2013):
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Database upgrades:
T-10385 Fix invalid foreign key reference in totara_cohort install
T-10462 Fix totara_message upgrade bug when no messaging report exists
T-10428 Fix totara_message upgrade bug when userfrom or userto do not exist
T-10315 Fixes for broken totaramessage report source in Report Builder
Improvements:
T-9580 Add option to Report Builder to filter by deleted/active users
T-10211 Add "is enrolled" filter to course completion by organisation
report source in Report Builder
Bug fixes:
T-10458 Fix issues with right-to-left languages in the Kiwifruit Theme
T-10371 Fix the wording of breadcrumbs on my/teammembers.php
T-6080 Fix display of debugging message
T-10446 Fix problem with navigation if "Learning Plan" block is placed too early on page
T-10400 Fix SQL error in My Learning for managers (Totara Stats block)
T-10399 Fix flushing of data in SCORM 1.2 if network connection fails
T-10412 Fix default page orientation in Certificate module
T-10466 Fix MSSQL query bug when viewing a user's forum posts in their profile
T-10405 Fix custom field placeholder substitutions in reminder emails for Facetoface
T-10389 Fix email subjects in Learning Plans when multilang filter is enabled
T-10414 Revert Audience search case insensitivity patch from 2.2.14 This was causing audiences based on "Menu of choices" custom fields to be empty
T-10384 Fix saving of import_deleted configuration field in totara_sync