I'm not even sure if that's what it's called, I just remember the term fomr my Material class back in engineering school. Basically, I'm talking about an internal crack inside the wood that you won't see until a cut is made at that location. Anyway, is it a common problem? As I'm making the body of my bass there's a crack at the edge of the body - looks a lot like someone accientally nick it with a rotary saw, but I know for sure that I didn't do anything to cause that crack. And as my brother also pointed out, it seems to grow a fair bit after about a week. What do I do? Just fill it with wood filler? Will it continue to grow until (or even after) I put on the final finishing seal?