I am running the Dude 4.0 beta 3 on Windows Server 2012. I added a number of device types by copying an existing device type, modifying some settings (such as image) and then saving them using distinct names. I can successfully assign devices to the new device types. However, when I restart the Dude Windows service or reboot the server the device types disappear and only one device type is available.
I have the same issue and i try already on win 7 and win xp same issue.