In this bug, guests/members who log on to the HTML5 version of xat who are registered CANNOT private chat staff members who have PCPLUS on that also have NOPC turned on. PCPLUS's original intent is to override NOPC so that only registered users can private chat them. For those viewing xat in HTML5, PCPLUS does not work, and only works as if the user who is a moderator or above has the NOPC power only.
Before I describe what happens in these screenshots, upon testing this, my main account is the account ranked moderator or above, and my alternate account is the account ranked a guest. My main account did NOT add my alternate account as a friend.
In the first screenshot, I am logged in as my alternate account on the HTML5 version of xat, where I can clearly see that my main account has the powers NOPC and PCPLUS. In the second screenshot, from my alternate account, I attempt to start a private chat with my main account who is on the Flash Player version of xat. In the third screenshot, using my alternate account, I return to the Flash Player version of xat and attempt to start a private chat with my main account, which in this case, PCPLUS power overrides NOPC.
Note: This bug may also apply to guests/members using the mobile version of xat as well.