I haven't tried u/FifthHorseman's method of deleting the key yet, but I wanted to post anyway to see if it is an unrelated error:
Tequila seems to operate fine itself, but PChat will not load, and both Icon and SCORE (beyond your purview, I know), have a flicker on the initial title screens that make them unnavigable. When I switch to windowed, the game quits responding (both versions).
This flicker occurs regardless of launching via Tequila or through the Icon exe itself.