Missing Inverse Kinematics panel in Bone properties menu

Hello. I’m teaching myself rigging and whilst setting up IK and rotation limits I found that the mac osx 2.53 (r30593) build of blender was missing the Inverse Kinematics panel in Bone properties menu. Should be between Display and Deform.http://aah.herobo.com/stuff/2.png

Downloaded the latest build (31802)… did a quick test and it was back…
http://aah.herobo.com/stuff/1.png

What’s got me confused is that when I open my rigging scene in the latest build the IK panel is gone again, does anyone know if there’s a way to get it back !?

figured this one out. The IK panel was at the top of the bone properties menu… now I know how modular the interface is…