Hi dude,
Finally I found the solution to fix it, I found it on an old Vanilla server. This solution worked for the guy who propose it, and it worked for me :
Go to
http://xquartz.macosforge.org/landing/ and download the latest version of XQuartz for mac. This wont harm your computer, I checked it. (If you believe me).
You may need to log off and back on for the driver to finish update.
Go to the Wineskin Winery wrapper (in the Finder) that contains the WoW-client, right click and select "show package contents"
Double click the Wineskin App looking button, this will open the screen you used to install the client in the wrapper. Select "Set screen options" and choose to "Use Mac Driver instead of X11."
Click "Done", exit the program and start your new and fully functional WoW client!!