I had a full inventory and was trying to summon a vending machine from a rune room, here's a key. F = full slot (with a rune in it) S = empty slot X = an item P = me, eyebrows and all L = the lever R = rune . = empty space ...... ...F.. ..XS.. ...F.. ...... ..PL.. ..R... ...... I'd picked up the rune, and then clicked on X (an item), to move next to the rune slot. I was carrying the rune on the mouse cursor. When the character arrived on the X tile, the rune disappeared and I was holding item X on the mouse cursor. The rune was never heard from again.
