Sometimes the beacon beam texture is changed, im not sure if this is a texture bug. I found the beam.png file, and it looks like the 'before' (see below) beam.
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This happens mostly every time. I've seen this glitched texture through SP and MP, I really dont get this bug.
Please force a crash by pressing F3 + C for 10 seconds while ingame and attach the crash report here.

This ticket is invalid as it relates to a modded or 3rd party client/server.
Any non-standard client/server build needs to be taken up with the appropriate team, not Mojang.
Any plugin issues need to be addressed to the plugin creator.
This site is for addressing issues related to the base unmodded MineCraft.

Relinked to MC-1279