I don't know what changed, but in the past couple of days my WoW has been freezing. All would be fine, then I go into an arena or a BG, charge some guy, and the game completely freezes. 
I also noticed that the full screen map mode is much, much laggier than normal - there's a noticeable lag between pressing 'M' and getting the map on the screen, and also my fps drops from 80 to 3 in map mode.
All these problems disappear the moment I disable oqueue, and nothing else helps.

try toggling off the fog of war.  it's the only thing happening while in a BG.

to toggle fog, type:  /oq fog

 

Disabling the fog fixed the lag in map mode, but my WoW still freezes when I charge, or even when I just join a raid if oQueue is enabled.

I have the same problem, I join a BG, Raid or Dungeon the very first time I try to attack something WoW locks up.

I do get an errror when OQ runs; a one_shot 18 error
Oqueque interface/addons/oqueque/battlegrounds lua 215 attempt to call field e6

Then says OQ removing timer

Not sure if that has anything to do with it, I did try the /oq fog command to disable  but when I hit enter it does nothing.  
 

When you hit enter after "/oq fog" the command doesn't disappear, so you might be misled it didn't go through, but it does.

I did as sugested in another thread and deleted oqueue from my addons directory which was 1.83 version, redownloaded it and installed in again which is version 1.83c and that seems to have fixed the problem.

Reinstalling seems to have done the trick for me, too. Thanks!