Recommended you upgrade to the 64 bit client by July 1st, possibly because it breaks with the pre-patch.

https://worldofwarcraft.com/en-us/ne...nt-this-summer

I'm curious how this effects boxers, do Hotkeynet and the others support the 64bit client? I'm also curious what Blizzard will do with Vanilla WoW as they hadn't started 64 bit until patch 4.3 which was in 2012.