[nsviper]

Sorted the audio crackling issue - changed Audio output to HDMI 2.0 (TV only has built in, not tested yet on surround sound system on other TV) - crackling disappeared.

Still can't see anything in the databases tho, even although on MySQL I can see:
xbmc_music46
xbmc_video78

The debug log has:

22:29:23 T:3039572512 NOTICE: Running database version Addons16
22:29:23 T:3039572512 NOTICE: Running database version ViewModes6
22:29:23 T:3039572512 NOTICE: Running database version Textures13
22:29:27 T:3039572512 NOTICE: Attempting to update the database xbmc_music46 from version 32 to 46
22:29:28 T:3039572512 ERROR: SQL: Undefined MySQL error: Code (1060)
Query: ALTER TABLE artist ADD strMusicBrainzArtistID text
22:29:28 T:3039572512 ERROR: Exception updating database xbmc_music46 from version 32 to 46
22:29:28 T:3039572512 ERROR: Error updating database xbmc_music46 from version 32 to 46
...
...
22:29:29 T:3039572512 NOTICE: Old database found - updating from version 32 to 46
22:29:29 T:3039572512 ERROR: SQL: Can't create database for copy: 'xbmc_music32' (1007)

But when I look at the tables themselves, I can see that the column strMusicBrainzArtistID (text) already exists.

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So, as a test, I dropped the 2 databases, and rebooted the Pi. I can see the database xbmc_music46 get created and populated from 32, and xbmc_video78 gets created and populated from 75

What I have spotted however, is that the VIEWS are not copied over, so further down the error log you get:

11:34:33 T:2895873088 ERROR: SQL: The table does not exist
Query: select * from movieview ORDER BY dateAdded desc, idMovie desc LIMIT 10

In Music32, there are 3 Views: albumview, artistview, songview - not recreated in Music46
In Video75, there are 4 Views: episodeview, movieview, musicvideoview, tvshowview - not recreated in Video78

Going to try and manually create these to see if it fixes issue, but thought I'd let you know.

(edit) Just spotted none of the triggers are in place either...