Random visual noise started appearing in my world, which changes as I move and look around. It originally happened in an older version (1.0.3), and it was appearing there, so I tried updating to the latest version of the pack (1.2.0) when I went back to try and continue playing recently and transferring the world file. No luck on getting rid of the glitch, it's still there and going strong. Looking around online I did find a thread about it on the FTB reddit, with someone having the same issue, but nobody had an answer as to what might be causing it or how it could be fixed.

The latest version of the pack is unmodified. In the old version I don't remember if I updated the version of Extreme Reactors to fix the issue that was preventing a larger reactor multiblock from forming or not, but if so it was the only change I made.

See screenshots for what the "noise" looks like.