The stats of gold pieces when used as missiles can be forgotten by the game, requiring reidentification of the gold stack.
The stats of gold pieces that are used as missiles can be forgotten by the game, requiring reidentification of the gold stack, when the player puts all his gold in the missile slot and then pickpockets some.
How to reproduce it
1. equip all your gold in the missile slot,
2. pickpocket gold from a monster (which goes to the backpack),
3. remove the gold from the missile slot.
The game won't display your missile damage in the @-screen anymore. (RFE 3491)
Attempting to display the 'M'issile weapon damage says "try to identify the 1234 gold pieces first". Using the Identify or Greater Identify spells on the gold solves the problem (scrolls also work). Presumably the "identified" flag for gold is lost in step 3.