I was using the analysis board to analyse a line of play... and I rejected the line because that bug (a 2nd king appearing on my back rank when my first king was put in check) came up and I didn't want my game to freeze or go through the problems listed above.
Just putting it out there -- the bug still abounds, even on the analysis board.
While playing my first game of chess 960 some interesting things happened. First off, after my opponents 15th move a second king appeared on my back rank, I couldn't move it and I couldn't move any pieces onto the square it was occupying. Then after my 25th move or so i hit submit move and the screen refreshed like it normally does and then the position from before i moved appeared accept i couldn't move anymore. So i sent a draw request which was accepted and now the game is still in the section of my games in progress and when i click on it it just says game drawn by agreement!!??