Shortly after login is see the following error message in bug sack:

369x bad argument #5 to '?' (Usage: self:SetVertexColor(color [, a]))
[string "=[C]"]: in function SetVertexColor' [string "@Interface/AddOns/XLoot/skins.lua"]:172: in function SetBorderColor'
[string "@Interface/AddOns/XLoot_Frame/Frame.lua"]:957: in function SizeAndColor' [string "@Interface/AddOns/XLoot_Frame/Frame.lua"]:1284: in function Update'
[string "@Interface/AddOns/XLoot_Frame/Frame.lua"]:1312: in function `?'
[string "@Interface/AddOns/XLoot/XLoot.lua"]:39: in function <Interface/AddOns/XLoot/XLoot.lua:37>

Locals:
(*temporary) = "bad argument #5 to '?' (Usage: self:SetVertexColor(color [, a]))"

f9c853a should have fixed that and should be represented in 10.0.0-8 on Curseforge.