https://mojang.com/2014/04/minecraft-1-7-6/
Update: We have released version 1.7.9 with an important bugfix to fix some
server crashes, and to resolve some skin related issues (including more
crashes)
Version 1.7.6 is now officially released. This version contains some
bugfixes, a few updates to make Realms even better than it already is and
prepares Minecraft for the renaming feature that will eventually allow you to
rename your player. The renaming feature will not be available right now, but
this is an important step towards it. We have also changed the internal
handling of player skins to make use of our new, improved skin servers.
Unfortunately the 1.7.6 version is not compatible with 1.7.5 (or earlier)
servers. Please update your servers to 1.7.6, this is also an important step
to prepare them for the upcoming 1.8 release. Servers should automatically
update all player profiles to the new format, but please make sure that you
are in the correct server mode (online mode/offline mode) when you start the
1.7.6 server for the first time, because profiles are not compatible between
these two server modes.
Because this is important, let me repeat that last sentence:
Please make sure that you are in the correct server mode (online mode/offline
mode) when you start the 1.7.6 server for the first time, because profiles
are not compatible between these two server modes.
// The Minecraft and Minecraft Realms teams