Found a bug when a guy in the line dies and you retreat, sometimes a skill gets locked (is green but you cant click it). Only work-around i could find was respec skills option cleared up the bug.
This seems to be a new problem with the preferences system, I'll try and fix this ASAP. - EDIT: OK, it's a problem with Chrome's new autoplay policies and Unity WebGL builds... looking for a fix...
Edit2: I've found a workaround, thanks to Marco Trivellato https://forum.unity.com/threads/chrome-on-the-dev-branch-version-66-may-block-audio-for-unity-webgl.517758/
Sorry! It should actually be fixed for real now.