BP : Can't remove autocompleted recipients

Hi,

Setup : WP 3.5 + BP 1.6.3

Have BP_MESSAGES_AUTOCOMPLETE_ALL on.

When composing a message, select user A and user B as recipients by means of autocomplete.

Then remove one of the users as recipient.

Message is sent to _both_ users.

Any ideas or hints highly appreciated!

Cheers
Mort3n

PS. Have also posted on the BP Forums
http://buddypress.org/support/topic/message-sent-to-removed-autocompleted-recipient/