This is why I hate upgrading.
I tried to upgrade from 2.6.3 and this is what I get.
Warning: require...../public_html/tapc.ca/wp-includes/compat.php) [function.require]: failed to open stream: No such file or directory in /home/cecon46/public_html/tapc.ca/wp-settings.php on line 238
Fatal error: require() [function.require]: Failed opening required ...../public_html/tapc.ca/wp-includes/compat.php' (include_path='.:/usr/lib/php:/usr/local/lib/php') in /...../public_html/tapc.ca/wp-settings.php on line 238