Smack - Openfire : sending message in MUC problem

I have a Smack client that works as expected with jabber.at. I recently installed Openfire 3.9.3 and I am facing an issue when it comes to messaging in the MUC. Here is my code:

mRoom = mucManager.getMultiUserChat(mName);

mRoom.addMessageListener(mRoomMessageListener);

Message message = mRoom.createMessage();

message.setType(Message.Type.groupchat); // in case…

message.setBody(“blabla”);

mRoom.sendMessage(message);

private MessageListener mRoomMessageListener = new MessageListener() {

@Override

public void processMessage(Message message) {

// never called !

}

}

The code mRoom.sendMessage(message) is executed, no exception is thrown, but the listener is never invoked. I also tried with Openfire 3.10.0beta, same issue.

Once again, the exact same code works with jabber.at as expected. Am I missing something ?

Any help appreciated.