OK first post, first off hello!
Second thanks for Nui I love it.
Now for the chat tabs, like others I run Nui wiht prat.
With prat's latest version 3.3.23, and Nui 5.06.29+ I have theproblem in that only my first tab (the one that is normally on the left) is shown which is what I believe this thread is about.
What I found was that switch back to Nui 5.06.28+ and all the tabs are returned and work as expected.
Hope this helps as to me it looks like something in the changes from 28 to 29 have caused this so should help in eliminating down what caused the hiccup.