The issue is indeed with Chrome and the affected users get the following Javascript error:
Uncaught SecurityError: Blocked a frame with origin "
https://www.happymeeple.com" from accessing a cross-origin frame.
This prevents the page to connect to our gaming server.
The message basically says that it does not allow the page to interact with an address that is not related to happymeeple.com. That is clearly not the case though. Our code has not been hacked. And our gaming server should be allowed.
I have no idea what is going wrong as I don't have the issue on my machine.
It might help if someone with the error opened the developer window (F12) and maybe find something useful there. I suspect there might be something in red somewhere to indicate a problem or maybe a warning somewhere in the console text. I can't see much on my end from the logs we receive.
In any case Chrome probably launched an update around the 6th of August leading to the error (added security?).