Minecraft 1.4.6 has been released today to fix some bugs and add a few minor features. Unfortunately, 1.4.5 servers and 1.4.6 clients are NOT compatible. This means that, in order to keep on playing with us, you must wait before upgrading!

The jump to the new version should happen faster than the 1.4 update as fewer changes have been done to the game. Please be patient until then!