In today's race my race viewer froze about 5 laps into the race. In fact it entirely froze my computer. Had to reboot the machine. 2nd time around it worked OK but my race was shot. Never happened like this before. Also I had tried to switch to my iPad but that wouldn't load at all. But I think you already know about App problems.
Running OS X 10.12.6
Firefox 56.0.2 (64-bit)