I think you should also include a post with all the changes you were making at the back end. By this, things like changes in rules of combat/rule set and other adjustments should have a post first before it goes live.

I'm not sure if it's only me but I noticed that the "fog of war" rule of combat, now includes opportunity ability meaning, Sneak, Snipe AND OPPORTUNITY abilities are now disabled during that rule of combat. I checked like your past week and never saw a post like this.

Also, I'm not sure if this was already applied before but I just found out today. My opponent was using Deeplurker on the said rule of combat and I thought there was a bug why it wasn't attacking. Checking the fog of war, Opportunity is now included.|

TLDR: Please update first before a change and not the other way around or worse, just surprise them and see if the players are paying attention.