I made a list just now, that I happened to recall has a character in it that I banned a long time ago. After I made the list and started studying, I assumed that I must have unbanned it at some point, because I didn't get any sort of reminder that there's an item in that list that was previously banned. When I saw the character pop up whilst cramming the list, I clicked on the magnifying glass just to take a quick look and saw that it was still banned.

So, the point of this thread is just to suggest Skritter's system automatically remind users if they make a list that has a banned item, or else it probably won't ever show up in the review queue.

Sounds like there's a disconnect between the items you have banned and whether they're being studied. What item/list is this?