Where: 
The drawing is open, but some of its details are not present 
In this case, the file may be corrupted, so it requires recovery: 
— Start SilicaCAD® 
— From the File > Utility menu choose “Recover” 
— Select the damaged file and confirm 
— After the procedure it is necessary to save the drawing for the operation to take effect on it. 
It is recommended that you use the “Save as” command assigning another name to the recovered file to avoid losing any crucial information that was not recovered.