Get Animation Clips, in Editor script, with 4.3, broken?

Since upgrading to 4.3.1 for Windows and creating some new Animation Clips in it, we can no longer see them when running Editor scripts on the animations to provide extra details. Is this a known issue? See code below:

int clips = animation.GetClipCount(); // = 2
AnimationClip oldClipFrom4_2 = aninimation.GetClip(“OldClip”); // = old animation clip reference
AnimationClip newClipFrom4_3 = aninimation.GetClip(“NewClip”); // = null

Fixed with marking animation as Legacy