Quote Originally Posted by Matthew Schneider View Post
I think that sounds like internal stresses, maybe caused by improper drying?

It's possible I'm not storing it properly. I have 100 board feet layed down on three even piles on the floor by species, with a large cloth over to keep dirt off. But I have some really thin boards of pecan off by themselves on a shelf that I'd expect would be dry by now that I can't flatten.
My understanding is internal stresses are inherent in the wood, but can become evident during the drying process as Danny has illustrated ^^.

Storing may be an issue. You don't mention, but is it stickered? I use 4X4's on the bottom every 16 inches and 1X stickers between layers. Good air flow is required. I would get rid of the cloth. Don't stack against a wall or in a corner.