Not related specifically to 15.1 content, but this has started happening only since the 15.1 patch on live.
When using equipment that allow usage of a certain skill (Randel Card, Smokie Card, Salvage Cape, etc), and then removing that equipment, the skill granted by said equipment still displays on your hotkeys, in spite of removing the equipment. You still cannot use the skill(until you re-equip the item), if you press the hotkey, nothing happens.
Edited by WolfTri, 16 May 2016 - 08:47 AM.