So Mavericks Server really made a mess in upgrading my Mac Mini from Mountain Lion. In the end, the Mavericks upgrade went well. Trouble began with installation of Server 3. About half way through ‘updating data’ the system would hang, and then get stuck in the old grey screen of death loop. Fixing permissions on the system folder solved the boot issue. Re-run server install, and bang! Same issue. Since I only care about the websites, I fixed the permissions again, then renamed the server folder. Created a new server folder and copied in the contents of my existing web folder. This time the installer completed (without fragging permissions), and successfully migrated my data… assuming you’re reading this. I’ll worry about what it got hung up on later… or never. After all, it’s an OS migration. Didn’t expect it to be flawless.