I have this problem too - and i had it before i rebound my keys - i think it's a bug in SC2 T_T - Just relog and it should work again.
Ah good to hear it isn't just on my end but still obviously not ideal for all of us. It's half the reason why I drop the UI in my player intros so I know if I have that tool available to me for the rest of the game haha!
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