Addendum:
The tag editor is reading the tags correctly, so it isn't an ID3 problem, however this is what getMusicDirectory is returning. The first item is clearly wrong. Notice also that it fails to find cover art.
http://<mysite.com>/rest/getMusicDirectory.view?u=*****&p=*******&v=1.8&c=test&f=json&id=210984
{"subsonic-response": {
"status": "ok",
"directory": {
"child": [
{
"id": 224167,
"title": "Live at River Plate (2012-01-01 DE 887654189523)",
"created": "2012-12-29T11:53:33",
"parent": 210984,
"isDir": true,
"artist": "Live at River Plate (2012-01-01 DE 887654189523)"
},
{
"id": 224166,
"title": "Gold_ Greatest Hits Live (1993 US Living Legend Records LLRCD 200 4013971002009)",
"created": "2009-04-25T16:07:11",
"album": "Gold: Greatest Hits Live",
"parent": 210984,
"isDir": true,
"artist": "AC/DC",
"coverArt": 224166
},