In the sky there's a strange white object which looks like a cloud but it doesn't respond to light level and it's location follows the player.
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Please force a crash by pressing F3 + C for 10 seconds while in-game and attach the crash report ([minecraft/crash-reports/crash-<DATE>-client.txt|http://hopper.minecraft.net/help/finding-minecraft-data-folder]
) to this ticket.
Try turning clouds off. They might be the source of the bug.