The preview feature of Windows Live Writer had never worked correctly for me. With the nice utility I got from Brandon Turner’s Donkblog post, Broken theme in Windows Live Writer? You can fix it!, I finally have it working perfectly.
I screwed up by attempting too many semi-automatic updates to my WordPress, PHP and MySQL. Had to uninstall then re-install WordPress and manually import the data tables to MySQL to get the blog back up.
Hopefully it works OK, if you see any problem let me know by leaving a comment or sending me an email.