Oh okay, I’ll try to keep the videos as short as possible next time. Much of the video is showing which bones are FK or IK. The part where I show the problem starts at 2:05.
The steps to reproduce this problem is:
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Assign markers to IK bones such as those of an arm. There should be 2 IK bones only, one at the upper or forearm, the other at the hand. To complete the chain, a marker should be assigned to a deform/FK bone in the arm. For example, the IK bones are for the upper arm and hand, and the deform/FK bone is for the forearm.
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Select the solver, then untarget the marker assigned to the deform/FK bone. In this case it’s the forearm bone.
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Pose the arm in Live Mode, then Snap to Simulation.
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The forearm bone will have some location and rotation applied to it, but it shouldn’t, because it is already untargeted.