Quote from RedBanHammer
I'll look into it, although it sounds like it could be an issue with how you are modding your jar. I personally use MagicLauncher to load all of my mods (including Durability101) and recommend you try it if the problem persists.
I am using magic launcher, However, i'm not using the default minecraft directory. I have my minecraft running on a ramdisk. but that should not matter.