Basically, I have a small mudpack and I'm using biomes O plenty. I explore a while, but then chunk errors arrive. Then, a memory leak appears and crashes me. Could it be another mod I am using?
What do you mean by chunk errors? Corrupted chunks? "Out of place" world generation?
How much memory is allocated to the game, and how many other mods are you using? You may as well just post the crash report, it'll provide that information and then some.
Realistic Torches - Causes torches to burn out after a configurable amount of time.
Nature's Compass - A utility item that allows you to search for any biome's location in the world.
Notes - Provides a clientside in-game notepad.
Souls - After you die, a hostile Soul that stores your inventory will spawn.
Auto Refresh - Automatically refreshes your server list and alerts you when your selected server comes online.
Pick Block Plus - A clientside mod that significantly improves the vanilla pick block function.
And a few others that we don't talk about.