While in ground combat occasionally when switching from a ranged to a melee weapon, the graphics will show the melee weapon in hand or on back even when the ranged weapon is equipped.
What's worse both weapons become useless as long as you are on that map.
You can't attack with either one, or even if you equip a different weapon.
However, unarmed attacks work if you unequip both weapons.
I hope I'm not the only one who's experienced this bug, usually happens when quickly switching back and fort between ranged and melee weapons. If it helps I'm using Ground auto-attack on slots 1 and 2.