Same for me. I have tried using this card twice today.
First time, I paid the additional 2 mana to prevent one of my creatures being destroyed. Despite the card resolving and the two mana being tapped and spent, I was not given the option to change the target of the spell.
Second time, I paid 5 life to prevent the top three cards being exiled from my library. Despite the card resolving and the five life being spent, I was not able to choose a new target for the spell.
TrafficWitch#32271
Same for me. I have tried using this card twice today.
First time, I paid the additional 2 mana to prevent one of my creatures being destroyed. Despite the card resolving and the two mana being tapped and spent, I was not given the option to change the target of the spell.
Second time, I paid 5 life to prevent the top three cards being exiled from my library. Despite the card resolving and the five life being spent, I was not able to choose a new target for the spell.