@Salty , @Jeto I and several others have noted there is now a new problem with Ultimate in that it will visually display that Ultimate is charged but it is uncastable (you cannot press and trigger the cast). It’s as if it’s not registering that the 60 mana condition is met.
In this screenshot, you can see the Ultimate is activated and displays as castable, but it is unable to be interacted with (unable to cast). I have to then match other gems to accumulate additional mana and then it may be interactable.
(I am using a Runic Ring)
