I just tried joining the chat on my android phone and I am unable to enter. It tells me the mobile version of the client is not available or authorized on my account. I was able to use the chat on android a few weeks ago.
The chat software requires your browser have a recent version of Java enabled. Not sure about the specific problems you're mentioning as I use Windows and Chrome with no problems. Maybe somebody else with similar hardware may have some pointers.
I'm using an iPad and was just in the chat room last week and the week before, haven't made any changes or received any updates, also just checked for updates and everything is current, not sure which way to turn on this one today,