It often happens that whle pressing Alt, I see the name of some items the monsters have dropped after a fight, but I can't find the item itself anywhere.
It would help a lot if not only its name was displayed, but also the item itself was highlighted, just like when you bring the mouse over them.
On the other hand, there were times when I could actually see the item visually, but I could not pick it up no matter what I tried. Maybe it fell inside some cover or something.