I will be playing on my snapshot survival world for about 20 minutes when my graphics will just freeze up. The game is still running, as I can hear the sound. The only way to get out of this is to cut the power on my computer. This issue has not taken place on any previous snapshot or pre-release, and is not a problem with my computer as it does not take place on any other program. I haven't enabled fabulous graphics, so it is not a problem with that.