Q: Upgraded to OS X Server 3 and now all my Enrolled devices are gone

I was able to resolve by following mscott_mdm instructions, I also had to remove the contents of the lab_session table.

Problem solved with Server 3.0.1!

Did you end up just updating to 3.0.1 and it fixed it or did you roll back and then do the upgrade with 3.0.1?

I will probably be trying this again soon in any event.

i rolled back but this should work too.

http://support.apple.com/kb/HT6043

I too had rolled back previously.

Just did the Mavericks upgrade then the Server 3.0.1 Upgrade and it worked like a charm.

Thanks to Apple for the pretty rapid fix on this one.