As you can see in the screenshot, my class ability and melee are fully charged, but the colour has not changed to purple. Its not game breaking, but looking quickly at the bottom left to see if abilities are ready, that colour is the indicator that they are.
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Sometimes, it changes back after using the ability and letting it recharge, but other times it's stuck on that gray color. Definitely not game breaking, but pretty annoying. [spoiler]The luckiest seven you will ever meet[/spoiler]