Several UI panels default to positions that cover up one another. Default size/position should be adjusted so that by default you don't hide one panel behind the other.
The panel sizes and positions should be saved across sessions so that when/if yo do resize or move a given panel to a preferred location, you don't have to do it each gaming session.
Anchor the panels so they cannot be partly dragged out of the viewport and make them dockable, such that they can be anchored to other UI elements or the viewport edge.
You don't see your own nickname in the in-game IRC chat client. In my case, after entering /nick Aesir, and receiving a generic confirmation that my nick was 'changed' to Aesir, the next line of chat I'd entered indicated it was from Aesir_1. Weird.