In previous version of Lightning DS, the App will just start up without trying to find anything then search for Lightning device and music library at background. This result in several problems as as the error message 'Please select a device' or 'Current server is offline'.
Since version 2.0, Lightning DS will try to find user's previous selected Lightning device and music library during the start up procedure. The App won't start before it can find them or after 20 seconds, it will tell people something is wrong.
If you are experiencing a long time to boot the App (more than 10 seconds), this means your home WiFi network may not be able to pass the SSDP message among network without drop out. You may need to verify if your network is adequate for streaming audio.