I'm not entirely sure whether this is a natural out-of-memory issue on a mod-heavy modpack, or there's something running away. But since installing the new Agricraft and InfinityLib, myself and a few other players on an SMP server have been crashing when returning to our bases. The crash does not occur when the chunks are loaded while logging back in. No AgriCraft stuff is in any of these chunks.

Crash log here: http://pastebin.com/hVcG5cd1

Edit: Another crash, same error, but looks like another error involving ArmorPlus' workbench directly above it, at the top of the crashlog: https://dl.dropboxusercontent.com/u/3553747/39a4b89f80.txt

Ah snap, yes this is an issue in my code, thanks for reporting.