OK - i tried adding --remove1d3v2u to the command line and that worked! Not sure I understand wh. If the ID3v2 tag exists, does tag not try to update the1d3v1 tag?
I have problems with tag.exe (v 2.0.47) saving my changes. It apears to run without error, but the tag doesn't change. If I run Tag against the file it shows the new tag, but running a second time s ...