Z axis coordinates not updating dynamically

[ubiquity]

While free moving an object I noticed that in the Information area showing dynamic x,y and z coordinates of object position the x and y coordinates are dynamically updated but the z coordinate remains at 0.00 even when there is considerable displacement in the z axis.
Attached is a screenshot captured during movement.

Once the new position is accepted (LMB) a subsequent check of coordinates using Absolute Command .move does show a current value for the z coordinate.

Wings Ver. 1.5.3
OS Windows XP