okay, looks like they changed a filename somewhere. will take a stab over the next few hours if I don't fall asleep rofl.
edit: well that was quick .. well for a quick check anyway.
Try looking at folder: \AddOns\nUI\Layouts\*** LAYOUT ***\HUDLayouts\** HUD STYLE **\nUI_HUDSkin_**LAYOUT**_Target.lua and looking for the following text and change nUI_CeneteredHUDto nUI and it should hopefully work. There are probably similar ones in Player.lua and once it is known that it is the culprit make the other changes appropriate.
Code:
elite_icon = "Interface\\AddOns\\nUI_CenteredHUD\\HUDLayouts\\Art\\nUI_HUD_EliteRight",
rare_icon = "Interface\\AddOns\\nUI_CenteredHUD\\HUDLayouts\\Art\\nUI_HUD_RareRight",
rare_elite_icon = "Interface\\AddOns\\nUI_CenteredHUD\\HUDLayouts\\Art\\nUI_HUD_RareRight",
world_boss_icon = "Interface\\AddOns\\nUI_CenteredHUD\\HUDLayouts\\Art\\nUI_HUD_WorldBossRight",