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Does anyone know why a totally unrelated vertex is moving with the vertex that I want to move when I'm trying to build a shape key in edit mode? There are no drivers and no unusual modifiers other than the armature modifier?

Vertices in their original position Vertices in their original position.

The only selected vertex moved upwards, the vertex in the red circle moves along in a completely random direction The only selected vertex moved upwards, the vertex in the red circle moves along in a completely random direction.

EDIT: A gif of how the rogue vertex moves A gif of how the rogue vertex moves

EDIT: Here is the blender file Bear.blend

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  • $\begingroup$ Could you upload your blender file? $\endgroup$ – Susan Jul 12 at 17:22
  • $\begingroup$ @Susan Just attached it to the question :) $\endgroup$ – Conny Dago Jul 13 at 12:45
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When in Edit mode, there is an Options tab in the Tool box (T). In the tab you had X mirror and topology mirror turned on. If you untick X mirror, the two vertices stop moving together.

(Also, you ought to Apply Rotation, (Control A/ Rotation) so that local axes agree with global axes, not that that was the cause of the problem. It can cause rigging problems if it's not applied. Also you should Apply scale (Control A/Scale) because if you ever animate a child object rotating around the bear it will inherit the Scale as it rotates, and become bigger on one axis, then shrink again as it goes further around)

enter image description here

Note that if you apply Rotation and Scale, but don't untick the X mirror box, the two vertices now move in a logical, mirrored direction at least. So your local rotation and scale values were interfering with the proper function of the X mirror tool.

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