Looking upwards at a certain degree makes beacon beams disappear as it seems.
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Strange. Perhaps it only happens when there's a lot of glass involved?

Exactly at -31.3 degrees, it stops showing the beam.
Edit: ...or 6 blocks away from the player... someone is being derpy today, sorry. π
Confirmed. Only happens with colored beams at least 6 blocks away from the beacon beam
Also, the higher above a beacon you are, the lower the angle needs to be before the beam disappears. For example, 20 blocks above the beacon, the beam disappears before I even get to looking level much less looking up. At 26 blocks it's ~ -30 degrees (if 0 degrees is looking forward).
Pretty recent. Occurred as a result of the visibility culling code that was put in to improve performance in 1.8.
The reason this happens is that as Mojang introduced, chunks unload(sort of) while looking away... They should have thought it through a bit more.
Confirmed fixed in 1.8.1-pre1! Thanks!
I am still experiencing this bug.
I am attaching the screenshots that contain the coordinates for the beacon block, the coordinates and field of view numbers at which the beam appears, and the ones at which the beam disappears.
If you need specs, let me know. I'm playing in a supposedly "vanilla" server, but similar issues are present in my single player games.
I use the resource packs by mumbo jumbo.
Yass, you're playing on 1.8. This has been fixed for 1.8.1.
Sorry, rebuilt the setup in the picture with staned glass, able to reroduce now.