Bugfixes:
User weren't notified when someone replied to their comment on a task, because the system failed to automatically subscribe them to the task's conversation after they left their initial comment, so it never sent them updates.
553.1
Users in the AU region were unable to find any matters created in the last three days because a recent software update caused a critical failure in the search indexing system. The process responsible for making new matters searchable was timing out before it could finish its job.