http://forums.worldofwarcraft.com/th...88059429&sid=1

All of the following are known issues that we are hope to have corrected in a future patch:


  • Starting more than 1 wow.exe simultaneously will cause the applications to deadlock
    - If you are multi-boxing, do not use a batch file or other method to launch multiple game clients at once

I have been locking up a lot today.. i turned off all addons and lowered settings to minimum and still crash. ( using ISBoxer )