Okay, this is weird and somewhat disconcerting - for the past few hours, I have not been able to access the Periodic Table (as in enter it, I can see it though).
The last message to me from a room owner was to not ping him as he was "sleeping", which I could not have known, and I only pinged him in a greeting as I saw his avatar enter the room.
There was no warning of a ban if this is one.