We are currently aware of a bug in Rocket Player that will results in the Rocket Player scanner running indefinitely and no music appearing in your library. This is definitely not the experience you should be having. We already have a fix for this and have uploaded it to the Google Play Store. Unfortuntately, the Google Play Store is recently taking around 7 days to approve and release updates.
In the meantime, you can get the latest version from the Amazon App Store.

Amazon App Store

Rocket Player on Amazon App Store

As soon as the Google Play Store updates with the new version, I will update that here.

In the meantime, try the Amazon version and please let us know if you are still seeing issues so we can get it fixed ASAP.