How are you browsing your Mezzmo library, through the Mezzmo Kodi addon (i.e. Vodeos-->Addons-->Mezzmo) or trying to use the native Kodi interface ? It the later it really isn't designed to work that way but it will as part of the Kodi database population. I highly highly recommend browsing via the addon and you'll see everything, including actor information. There's an autostart option to launch the addon to your preferred playlist upon Kodi start.
To get more detailed, upon an initial load of the Mezzmo addon or clearing of the Mezzmo data in the Kodi database, it will take up to 6 hours to sync in the background. This is by design for large libraries on low powered clients. However, by using the Mezzmo addon to browse your library you get the information in real time and the addon will update the Kodi DB real time as you browse so you'll always see the current information from the Mezzmo server. The background sync process will keep track of whether it is in sync with Mezzmo or not. Once it detects full sync it stops doing real time updates in the database as you browse since it isn't needed and the hourly sync process catches anything new. Each day the addon does a full resync between midnight and 6AM. You'll see that in the sync log viewer in the addon.
Jeff
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