The interface to the blackboard has been simplified.
You must be using view 0 or 1 in order to write on the board. Out of body views will not work.
Change your focus to the first narrow setting by pressing "p" in the graphical window until you get "Focus: narrow" at the top of the textual window.
Once you have attained the relevant values, you can display text onto the board using the text client. You type a '"' which brings up a "Say" prompt, and then you can type your message in. The line is only displayed when you press Enter. E.g.
and the board looks like:
When you have finished typing on the board, you will probably want to return to a "wide" focus setting, using the "p" key to toggle focus. You will notice that once you leave the narrow focus setting, you can no longer write on the board. This is because the right hand value has fallen below 1.0, and the only way to raise this value to 1.0 is using the narrow focus setting.
There you have it!