Feed the Beast visual bug.

[Krinen]

I'm not quite sure what to search, where to go, or who to turn to, so I'll post here.

Recently, as in I-don't-actually-know-when, also known as the past two days, my Feed the Beast client has been producing a weird visual error. While looking around, manipulating objects, or really doing anything halfway important, the world around me de-renders. most placed blocks disappear (Walls, buildcraft pipes, doors, all of that nonsense). It's completely random in nature, both in cause and resolution. I have one image, and have no other way to describe my issue.

http://puu.sh/2e8lX

I'm running the Direwolf 20 pack, latest patch, on a server. Nobody else is experiencing this issue.

 

[Booker The Geek]

Can you put your console into debug, and go and reproduce the error, then post the log to pastebin please?

 

[Krinen]

Would the console normally print an error immediately following the bug's appearance, or would it remain hidden until I pastebin? Because I'm staring at the console, recreating the bug, and nothing's being written. At all.

If it helps, I have more screenshots of what it is that's happening.
Before: http://puu.sh/2exBl
After: http://puu.sh/2exBq

I know it's not the texture pack, and here's the pastebin of the console at that moment.
http://pastebin.com/Xn4DUXb1

 

[Booker The Geek]

There is a setting inside optifine.... Multi -gpu for something or another... Turn it off and what happens?

 

[Krinen]

Is the setting in-game, or externally somehow? I can't actually find any such thing.

 

[Krinen]

Hm. I've set my Chunk Loading to Smooth, instead of Multi-Core.

It seems that was the option in question, which I before thought was referring to CPU. This has, as far as I can tell, alleviated the problem entirely. I'll keep updated.