I have a problem with the chat box. I alternate between playing on a PC and playing on my phone. Often when I switch, the chat box opens with messages from "System" - with info I already got while playing on the other device. All well, if I could just close the chat box. However, if I close it and then click some link, the chat box reappears. The only way to make it go away, is to type a message (one letter is sufficient) and send it. If I close it after THAT, it stays closed.
Another problem is that it's impossible to use the chat function on a phone. When enlarging the screen, it is impossible to pan down to the chat box - it just keeps moving down, always staying below the screen area. The only way to use it, is to NOT zoom, in which case it's impossible to read the text in the box.