Hi Erin,
Thank you for the post. At least it shows that I have not gone mad and that there is indeed an issue with the enum in 10.2.
Using REST may be an option for some but as the ADMIN REST service requires an Admin token (ie admin user name and password) and I need all end users to be able to see the ArcGIS Server version, this unfortunately is not an option in my case.
Thanks again.
Scott