I have extrem Chunk errors since the version 1.0.4 (At 1.0.3 it wasn't so extrem.)
So, my Chunks are "flashing". The Chunks are disappearing for some milliseconds and then there are back. It's not good for my eyes D:
I've don't tested if it works with rendering, but I think it would work.
(I only use the Replay mod, NO Optifine or else.)