Blizzard giveth, and Blizzard taketh away! While many people have enjoyed the splendor that is the 64-bit client for World of Warcraft, it seems that the upcoming patch 4.3.3 is going to break it, forcing users back down to the 32-bit client. To make matters worse we don't know how long it will be until we get another functional 64-client.
If you were previously running the 64-bit client, according to Blizzard you need to delete the following files in order for the patch to work properly.
- World of Warcraft-64.app
For more information be sure to check the support website.