Actualy no... Reseting game client/addon settings did not work for this issue. And once again no... EN_US does not contain the core expansion/patch files. Took less than 1 minute to repair.

Oque black screen fix

I've had the black screen issue ever since the Blizzard update that made Oque break. I recently just found a fix for it.
What I did was go into the World of Warcraft folder (C:/ProgramFiles/Worldofwarcraft) and deleted the entire "WTF" folder.
I then went into the "Data" folder (C:/ProgramFiles/Worldofwarcraft/Data) and deleted the "En_US" folder in there. <-- (probly has nothing to do with it, but was in my process that made it work)
After that I launched WoW and let it repair itself. Logged in and made sure Oque was in the add-on list. Typed /oq in game, and Boom working Oque.

I know im not the only person that has had the black screen issue. I haven't seen any other suggestions on here that have worked. So, hopefully this will work for you guys!

The folder that is given after the unziping does NOT work. You need to take the folder that is inside of THAT folder. Kinda rubbish that the install guide on here fails to mention this at all.

1st error is at top of post.  I've tried to do a clean install by removing all oque files and installing 1.8.7a,  I've also removed all other addons to see if there's a conflict.  I've even tried to install a previous version that worked just before the blizzard patch. Still just getting a blank oque screen.  From what I've gathered from some friends that use oque none of them have any luck with 1.8.7a.  The only one's that seem to not get a blank screen are users who are using a previous version, and they stated that although it's not a blank screen it still doesn't work with invites.  Damn Blizzard and thier patches haha.  If you figure out what's going on I'd love to know, playing WoW without oque just isn't the same lol. 

Lol No offense, but I've been playing WoW since '06.  I know how to properly install an addon... 
If it was not properly installed it would not show up in the add-on list, and it certainly would not open oque with a blank screen, no mini map icon. Sounds like a code issue to me.  Also the above error i posted is not the only error i get. There's this one too:

Date: 2014-04-09 19:09:51
ID: 4
Error occured in: Global
Count: 1
Message: ..\AddOns\oqueue\oqueue.lua line 309:
   attempt to index field 'options' (a nil value)
Debug:
   [C]: ?
   oqueue\oqueue.lua:309: ?()
   ..\FrameXML\ChatFrame.lua:4315: ChatEdit_ParseText()
   ..\FrameXML\ChatFrame.lua:3969: ChatEdit_SendText()
   ..\FrameXML\ChatFrame.lua:4008: ChatEdit_OnEnterPressed()
   [string "*:OnEnterPressed"]:1:
      [string "*:OnEnterPressed"]:1

I have yet to come across anybody with a working oque since blizzards patch that broke it.  Forums seems to confirm this as well.

Have... lets just face it, 1.8.7a is broken.

1.8.7a Black screen

Have tried everything posted in forums to get 1.8.7a to work but all i get is a black screen and an error message:

Date: 2014-04-09 15:17:02
ID: 3
Error occured in: Global
Count: 1
Message: ..\AddOns\oqueue\oqueue_ui_tools.lua line 203:
   attempt to index field '__frame_pool' (a nil value)
Debug:
   [C]: ?
   oqueue\oqueue_ui_tools.lua:203: CreateFrame()
   oqueue\oqueue_ui_tools.lua:349: panel()
   oqueue\oqueue.lua:14726: create_ui_shade()
   oqueue\oqueue.lua:14770: badtag_shade()
   oqueue\oqueue.lua:24988: ui_toggle()
   oqueue\oqueue.lua:300: ?()
   ..\FrameXML\ChatFrame.lua:4315: ChatEdit_ParseText()
   ..\FrameXML\ChatFrame.lua:3969: ChatEdit_SendText()
   ..\FrameXML\ChatFrame.lua:4008: ChatEdit_OnEnterPressed()
   [string "*:OnEnterPressed"]:1:
      [string "*:OnEnterPressed"]:1