I just got this note from Engage that contributions aren't saving.
"I seem to be having some difficulty entering gifts into Civi. Whenever I go to save a gift, I receive the loading circle, as if it’s processing, but never goes any further. If I go to cancel the gift I was attempting to save and refresh the page, the action will look to have gone through, but doesn’t save the soft credit."
I just tried myself and it wouldn't save for me either.