German umlauts are no longer available when holding keys a, o, or u
Somehow when holding keys a, o, or u the umlauts and other symbols that were available are no longer there. Instead, it types a line of letters which I press.
Tried on different keyboards - US, ABC, ABC extended.
I know there is another way with [option} + u, but it's inconvenient
Thank you for help
MacBook Air 13″