The message that now appears the first time you join a chat room (for a given site, it appears?) looks odd on M&TV's chat. Specifically, the "OK I'll keep it in mind" button isn't visible until you hover.
For reference here are the pop-ups from three different chat rooms: the C# room on SO, The h Bar on SE, and The Screening Room on SE:
The C# Chat room
The h Bar
The Screening Room
As you can see, there's a big blank space where the button should be for M&TV, but if I hover over where the button should be, you can just barely make it out: