I don't think i detailed my problem well.
All my album artwork syncs bar one.
However in the music app about 20% of the artists have a thumbnail.
I'm going to try ur fix now. if it doesn't work, then i'll have to dump iTunes match.
edit: ur fix seems to be working actuality! thank you. the only problem i have though is if the artwork is coming to albums now? ? how long does it usually take to sync?