Was just exploring (mid flight) about 200 blocks from where i had been building and the game just crashed... that's about it... wish i could tell you more but that's all that happened.
Environment
OS: Windows 8 (ver 6.2, arch x86)
Java: 1.7.0_45 (by Oracle Corporation)
Launcher: Minecraft Launcher 1.3.1 (bootstrap 5)
Minecraft: 1.7.2 (updated Sat Oct 26 02:00:00 NZDT 2013)
Seems to be a duplicate of MC-32168, check there for further updates.