Arg, I was scared to see the game completely broken but apparently there is a known issue only with chrome 63 https://forum.unity.com/threads/webgl-issue-with-chrome-63-0-3239-84.508583/
one minor update later and everything was back to normal ...
Arg, I was scared to see the game completely broken but apparently there is a known issue only with chrome 63 https://forum.unity.com/threads/webgl-issue-with-chrome-63-0-3239-84.508583/
one minor update later and everything was back to normal ...