We have been reported an issue where if the user reboots in offline mode, he is not able to change back to online mode. This is a bug and will be resolved on our next update.
Workaround: Switch to online mode then reboot. This should bring the server back to online mode.
This has now been fixed and released on version 2.0.6
How do you use Offline Mode ? I tried however everything looks like it’s in the Cloud?
Offline mode is essentially if you don't have an Internet connection and this will mark any online album, tracks or playlists as not being available.