Hi Michael,
You were right. Those changes in snapping mechanism seem to be risky :)
1) draw a rectangle (Rect/Cent) - origin as a first point, width:10mm height:10mm
2) run a Chamfer command and set a 2mm distance up
3) pick the point A, then point B to change a distance to 3mm

4) move mouse a bit...oops....
If you turn the object snap "On surface" off or use the points C and D for setting a distance, MoI doesn't crash.
Note, it is the same for Fillet.
Petr
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