I've never had issues creating administrative images previously, but I cannot get the SW 2013 SP03 admin image to work. It creates fine, but when I run it I get the following error

The administrative image is not marked as valid:.

Images are marked valid after they have been created successfully, by updating the file .\\sldim\admin.dat.

I've poked in the admin.dat file, but it states that it's not to be edited.

Any help would be much appreciated.

Regards,

Glenn