Bug description:
shortly after completion of the dual class quest, all the icons (skills, items, actions, macros' shortcuts) have disappeared from hotbars. All the slots turned empty, as if I obtained a totally new subclass instead of the existing lvl 80 one.
I've done it three times on three different characters, the result was the same: all the shortcuts were gone.
Every time it happened under different conditions: on the first toon they disappeared when I ported to Gludin arena, on the second toon they got lost when I switched subclasses, and when I logged on the third toon on the next day after completing the quest all I saw was the blank shortkey window. So, it looks like this bug inevitably occurs once you've upgraded one of subclasses to a dual class.
I don't think it's a very serious issue compared to other GoD-related problems, but it's pretty irritating as it takes a considerable amount of time to drag back all the shortcuts (you know, there are 120 slots in total).