I don't know if this is intentional or not, but tinkers construct tools aren't stored correctly. When I load up a world and have my starting kit of a hammer with haste, I get some sort of square icon and the item doesn't behave as a hammer anymore.

What versions of MC and the mod are you using?

mc: 1.6.4
mod version: 1.6.4.r03

NBT item support was not added until 1.7.2. This will not be retrofitted to 1.6.4.

oh, ok thanks