When I inspect someone else, all item level show up as xxx and this is my error. I've tried reloading and it does this every time.

Message: Interface\AddOns\oqueue\oqueue.lua:22873: attempt to index field '?' (a boolean value)
Time: 03/10/14 06:40:22
Count: 2
Stack: Interface\AddOns\oqueue\oqueue.lua:22873: in function `paperdoll_clear'
Interface\AddOns\oqueue\oqueue.lua:22396: in function `?'
Interface\AddOns\oqueue\oqueue.lua:21253: in function <Interface\AddOns\oqueue\oqueue.lua:21250>

Locals: frame = InspectFrame {
 0 = <userdata>
 TitleText = InspectFrameTitleText {
 }
 portrait = InspectFramePortrait {
 }
 TopTileStreaks = InspectFrameTopTileStreaks {
 }
 leftBorderBar = InspectFrameLeftBorder {
 }
 unit = "target"
 _ilevelcb = oq_check {
 }
 topBorderBar = InspectFrameTopBorder {
 }
 selectedTab = 1
 numTabs = 4
 CloseButton = InspectFrameCloseButton {
 }
 topLeftCorner = InspectFrameTopLeftCorner {
 }
 Inset = InspectFrameInset {
 }
 portraitFrame = InspectFramePortraitFrame {
 }
}
(for generator) = <function> defined =[C]:-1
(for state) = <table> {
 1 = oqgems {
 }
 2 = oqgems {
 }
 3 = oqgems {
 }
 5 = oqgems {
 }
 6 = oqgems {
 }
 7 = oqgems {
 }
 8 = oqgems {
 }
 9 = oqgems {
 }
 10 = oqgems {
 }
 11 = oqgems {
 }
 12 = oqgems {
 }
 13 = oqgems {
 }
 14 = oqgems {
 }
 15 = oqgems {
 }
 16 = oqgems {
 }
 17 = oqgems {
 }
}
(for control) = 2
i = 2
v = oqgems {
 0 = <userdata>
 gem = <table> {
 }
 ilevel = <unnamed> {
 }
 _slot = 2
 is_left = true
}
(for index) = 1
(for limit) = 3
(for step) = 1
j = 1
(*temporary) = true
(*temporary) = <unnamed> {
 0 = <userdata>
}
(*temporary) = nil
(*temporary) = "attempt to index field '?' (a boolean value)"

Hope this helps to fix some problems, Tiny.

                          -Merdeath of Quel'dorei

As further info in the quest to resolve this, these are my addons I have installed:
http://imgur.com/a/THxzl

if you disable all addons except oQueue, then you know whether or not it's a conflict.

please do that and let me know

I turned all addons except LUI and oQueue off and no longer get it, but also don't get it when i turn them all back on.

if it pops up again, please try to find out which addon is the problem