Modular Control Rig FK to IK Rig Broke

I’ve just created my first full character rig all in engine!

Skeleton, skin and weight points, Modular Control Rig, and animation. However, I’m experiencing a major issue switching between FK and IK. It appears that the underlying IK skeleton is not working properly. I can verify that the skin weighting is working on the FK rig though.

Anyone experience this and have a fix?