The game started lagging, especially when I went into the nether in my superflat world (redstone ready).
Then this happened.
World is no longer playable. 😞
I have experienced this as well in 1.4.3 prerelease.
done in 1.4.3 prerelease
AHAH! Someone else got that! I'm glad I'm not the only one!
This has been happening to me since 1.3! (it got a LOAD better when they fixed the animal-eating-wood glitch, but it still flashes a randomly in the hotbar in the 1.4 Pre-release)
For me, it tends to happen when there are a lot of entities in my vicinity. It also seems to only happens on SSP.
This has been happening to me in SSP and SMP. Before 13w05a and 13w05b, I could run smooth lighting, but now it causes me a lot of jitery lag.
It reminds me of when they tried to fix lighting last time 😞.