The attempt to upgrade the site to WordPress 2.6.5, MySQL 5, and PHP5 failed. I was able to fall back to a backup that I made prior to upgrade, but the Travel Log page no longer displays correctly. Fortunately, the data for the Travel Log is safe in the database. After falling back to the backup, I have upgraded to MySQL 5 and PHP5 it appears to be working. Three more days to the Canberra Half.