When I visit the Post Action configuration tab and click on edit, the list of IM addresses to send notifications to will be output like the following

[user1@chat.example.org, user2@chat.example.org]

If I were to save this form this list gets saved as it appears. The next time I edit this configuration it will be output as

[[user1@chat.example.org, user2@chat.example.org]]

and so on.

This only occurs when there is more than one address in the input box.