Difficult Words - New Changes

I’m assuming there was just recently an update to the website, but now when attempting to add (or remove) a word from the difficult words list, it is very hard to tell if the word has been added or removed. The lightning bolt is very faint and only flashes momentarily to add a word but does not remain illuminated to signify the words is in fact on the list. Has this happened to anyone else (i.e. is this a site wide phenomenon) or is this just a problem with my computer?