WowAce

As of patch 10.2.5, typing /suf no longer opens Shadowed Unit Frame options (apologies if I am doing something stupid to generate this error!). It's possible this bug showed up earlier and I simply had not tweaked my settings — the add-on itself seems to work fine with existing settings. When I try to open settings, I get the following error in BugSack:

25x ShadowedUF_Options/config.lua:6421: bad argument #1 to 'lower' (string expected, got boolean)
[string "=[C]"]: in function `lower'
[string "@ShadowedUF_Options/config.lua"]:6421: in function <ShadowedUF_Options/config.lua:6408>
[string "@ShadowedUF_Options/config.lua"]:7570: in function <ShadowedUF_Options/config.lua:7557>
[string "@ShadowedUF_Options/config.lua"]:7596: in function `Open'
[string "@ShadowedUnitFrames/ShadowedUnitFrames.lua"]:924: in function `?'
[string "@FrameXML/ChatFrame.lua"]:5291: in function `ChatEdit_ParseText'
[string "@FrameXML/ChatFrame.lua"]:4948: in function `ChatEdit_SendText'
[string "@FrameXML/ChatFrame.lua"]:4984: in function `ChatEdit_OnEnterPressed'
[string "*ChatFrame.xml:141_OnEnterPressed"]:1: in function <[string "*ChatFrame.xml:141_OnEnterPressed"]:1>

Locals:
(*temporary) = true
(*temporary) = "string expected, got boolean"

 Its also not in Game Menu>Edit>Add Ons. Not sure if it used to be, just started playing WoW again.

Seems to work now.