buddypress compose message to more persons

Dear,

I would like to ask help for my buddypress plugin. In the past when i click on compose message, i could type a name and press shift + enter to add more persons. Now I can’t. It opens a new window with exact same imagescreen. When i try that now, it create a new window with message not send. I changed the theme and experienced exact the same problem.
could anyone help with this?

Big Thanxs