I've been using the "Add to Queue" feature on the Vocab -> Lists -> Your Queue page to add characters and words to my queue.
Today it doesn't seem to be working. I can paste a list of characters and validate them, and they all turn green. But the "Add 4 Words to Queue" button at the bottom of the screen doesn't seem to do anything.
One other minor point - in testing this just now, I actually pasted 5 characters, but the button at the bottom says "Add 4 Words to Queue" (not 5), and the green counter at the top shows 4, not 5. Not sure if this is related or not; just pointing it out.