There are two bugs in the new version (7.1) of grid’s drag-n-drop functionality:
-if someone moves and drops back the ‘shadow’ of the column to its own header, the column mysteriouly disapears.
-if grid data is empty and someone drops the shadow to the empty grid body, somehow the column is moved to the end of the column list.
you can check here:
it was ok in the 7.03 version.