Windows 7 64bit and Nvidia GTX 970
Broken: 2.79b f4dc9f9d68b
Short description of error
Animating a chain of bones with Auto IK enabled will not record during Playback (Automatic Keyframe Insertion during Playback)
Exact steps for others to reproduce the error
Step 1: Create a new Armature (Single Bone)
Step 2: Subdivide the bone
Step 3: Switch to Pose Mode
Step 4: Enable 'Auto IK' (Tool Shelf)
Step 5: Enable 'Automatic Keyframe insertion for Objects and Bones' (Timeline Editor)
Step 6: Select the last bone in the bone chain
Step 7: Press Play (Alt+A) and move (G key) the selected bone in the viewport
Step 8: Left click to confirm before playhead reaches end of Timeline.
Key frames will be created in the Timeline Editor but the movement of the bones will not be recorded.
Blend file includes Steps 1-6:
Blend file includes recording attempt: