Engineers in 2D mode

[makigono1]

Situation: User running single player in 2D mode, with engineer unit on a road bridge hex, with sufficient resources to destroy bridge.

Steps:
User selects engineers unit.
User selects destroy bridge option.
When prompted, user selects hex to move engineers following destruction of bridge.

Observed result:
Bridge is blown, and engineer unit is moved to new hex, but it is not drawn there, nor does the unit get erased from the bridge hex. In other words, the screen will still show the engineers to be standing on the hex where the bridge used to be before it was blown, but if user mouses over this spot, the unit is not actually there. if the user mouses over the desired destination hex, the engineers unit will be there, but not actually drawn in this hex. They will be invisible, until selected and moved.