When I try to open a geometry file in DesignModeler, I get the following script error:
Error: 'ColumnHeaders' is null or not an object
Source: Microsoft JScript runtime error
The Model / Construction tree is missing from the left side of the window.
This is a known bug that occurs when the Panes are resized to the edge of the screen.
To Reset the Panes:
Start > Run > Regedit.exe
In Registry Editor, browse to :
Right Click on "AGApplet"
Restart Workbench / DM.