I just did an automatic upgrade to WP 2.2 with Fantastico. At first it botched all my icelandic characters, but I found a support thread that fixed that (by deleting define(CHARSET) command from wp-config.
So now my characters are showing fine, but I get this error message at the top of my page (and on admin page 'Manage posts'):
"Warning: Invalid argument supplied for foreach() in /home/besserwi/public_html/blogg/wp-includes/classes.php on line 88"
.. and every internal link I click(comments and static pages) now leads to my front page.
Can anyone help, please?