Hi, I was having the same issue with changing the Artist and Album tags. I went into 'List' and changed them in there however, the Artist still showed up as 'Unknown Artist'. So I ran the erase tools and all that, I changed it in WMP11 and still had same issue. I fixed it though by going back into 'browse' mode in the Zune software and then in the leftmost column where it list all the Artist names - right click on the one you want to edit and change it there as well. Mine still shown up there as 'Unknown Artist' regardless of what it said in 'List' mode. This fixed it for me. Hope it helps everyone.
