"warping bending or cupping" is really not a different subject than "just cracking"... they all happen because wood is hygroscopic, it gains and loses moisture as the relative humidity changes, and consequently swells and shrinks accordingly. That swelling and shrinking causes the warping, bending, cupping and cracking as some parts of the board swell or shrink more or faster than other parts. As was said, quartersawn and riftsawn boards don't twist or cup as bad as flatsawn. If by "cracking" you mean cracks appear in the end of the boards, that happens no matter how you saw the boards as boards lose moisture faster from uncoated ends than anywhere else, and thus that end few inches shrink as moisture is lost, and thus cracks appear.