Since the last update half of my characters in the training window have blinking yellow up arrows on their portrait, indicating I have covers to use on them to train their powers. Only problem is: I don’t have any covers left in the rewards section. So why do I have all those blinking arrows. Do those show something different now, or is it a bug?
Honestly I think that is intended… You can technically train… you’d just have to pay in HP.
I’ve noticed that on my Doom who has 5 Black but hasn’t gotten a Blue drop yet, I don’t have the arrow.
Haha I got excited when I first saw an arrow over my Spidey and thought i’d miraculously won a cover!! 
ah yeah that is annoying! hopefully it reverts back, or is a bug.
I hate it.
they want your hero pointssssssss
Nope, simple bug in this case.
Hooray!