> I start with a clean working tree, build, start the rm501 config, and
> home the machine.  Then I switch from joint mode to world by hitting
> "$", and things go wrong.  The X, Y, and Z DRO values become NAN, and a
> big chunk of the robot arm in the vismach view disappears.

Just updated the robot's initial position in the homing sequence.
So that the inverse kinematics is defined for this position (no more NANs).

Is there any way to prevent the user from moving the robot into
undefined positions?

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