The title says it all. I have been told this is a known issue but can't find any details on it.
ISSUE: The 32 bit client works fine. When I have 64 bit enabled I can log in, but as soon as I choose a world and hit "Play" there is a brief "Getting in line to connect" message and then it closes completely.
I am running Windows 8.1 and it is a 64-bit OS.
Any help would be appreciated.