Sounds like you're hitting another issue in which the favorite scopes are empty. I saw something similar sometime ago, but not sure how it happens.
Try 'gsettings get com.canonical.Unity.Dash favorite-scopes' and see if it returns an empty list. If so, then try 'gsettings reset com.canonical.Unity.Dash favorite-scopes'.
Hey Olivier,
Sounds like you're hitting another issue in which the favorite scopes are empty. I saw something similar sometime ago, but not sure how it happens.
Try 'gsettings get com.canonical. Unity.Dash favorite-scopes' and see if it returns an empty list. If so, then try 'gsettings reset com.canonical. Unity.Dash favorite-scopes'.