Some sort of Wooden Water Tank visual glitch, probably due to the connected textures, causes for both client-side crash, and server crash. I went to break the Tank, but the textures wouldn't connect, so i broke it, and replaced it, and crashed. Odd, but whenever the chunk is loaded, the client and server both crash. On version 1.4.5, in the infinity evolved pack.

Update to 1.4.6-hotfix and give me the crashlogs on that version please.

Will do as soon as I can

Issue seems to have been fixed with hot fix, many apologies, thanks