I cannot open the Corridor Objects tool (Bucket Icon) so to modify a corridor I have to use the Properties dialog box selected from the Project Explorer.
I was trying to change the stations for a Parametric Constraint but when I would edit the station I would get a Property is not Valid dialog box with Details of Object reference not set to an instance of an object.
Next I tried to simply change it from Enabled = True to False and the same thing happens and eventually the MicroStation has stopped Working dialog box opens.
How can I recover a working and editable corridor from this file?