Try this in another template.
Create a figure database and mispell it.
Call it Disappearing Data
Recreate another figure database and correctly spell it.
Call it Actual Data, and populate it.
Save the template. Check your db path. There should be files on both.
Close Civil 3d. The Disappearing Data files should disappear. They do for me.
Open Civil 3d and select the template that you created above.
Do you have the Disappearing Database entry? Check the db path location. The fdb and ldb files for Disappearing Database should be "created".
There is something in the drawing that creates those files! That is what I want to delete.
Matthew Anderson, PE CFM
Product Manager
Autodesk (Innovyze)