I also found this problem happening just now.
Environment: Brave Browser v.0.22.727, Mac OSX v.10.13.4
On a similar note to the SerberDM's result:
The animations seem to be 'confused' the 'Battle' animation occured when I selected 'natural' and the 'default' seems no different to 'slow'.
Can't see the Pointer when playing


Also, I must mention, when it went to battle mode your moves did not take effect until your player made their move. So you move a pawn from h2 - h3, it stays on h2 and only updates when your opponent plays.
It happened the same to me also, I had to rightclick the board to see the last movement I've made otherwise i had to wait until my opponent moved his piece!
Strange things happening right now!

What animation setting do you have? Natural or Arcade perhaps?
I have an Arcade Animation, is that it?
Beta Bug Report (Pointer not shown on game)
Overview: When I play 10 min games on my computer the mouse isn't showing anymore
Environment: Mozilla Firefox 61 (Linux Ubuntu)
Steps to Reproduce: Clicked on play, 10 minutes
Result: Once the mouse pointer enters the board It's no longer visible
Expected Result: I should just see my mouse pointer on the screen for me to play normaly
I was able to play perfectly until about 4 hours ago, but now it appears to be updated somehow with new animations or something, I didn't change any animation settings or anything related to it, so I think is some update...
You can see in the image that I'm holding the e2 pawn (it's a little bit moved) with my pointer and it's nowhere to see...