Why is Loopcloud rescanning my Library?

You may notice that when you upgrade Loopcloud, the user content in your Library is automatically re-indexed. You'll see the progress of this in the bottom-left corner of the Loopcloud application in the status bar: 

Loopcloud has added a range of new features that use AI and analysis of audio attributes such as using the Audio Filters and Find Similar Sounds, which require your sounds to be re-analysed. 

This will only happen the first time you open Loopcloud after updating to Loopcloud. The speed at which this completes will depend on the amount of user content you have imported to Loopcloud. It's advised that you leave this to run the first time you update (you can use Loopcloud while this runs in the background).