What about Error 13? I get the following error:
WordPress database error: [Can't create/write to file '/var/folders/fe/feFkwrivG5y0WiL8OadFbk+++TI/-Tmp-/#sql_24e_0.MYI' (Errcode: 13)]
SELECT t.*, tt.* FROM wp_terms AS t INNER JOIN wp_term_taxonomy AS tt ON tt.term_id = t.term_id INNER JOIN wp_term_relationships AS tr ON tr.term_taxonomy_id = tt.term_taxonomy_id WHERE tt.taxonomy IN ('post_tag') AND tr.object_id IN (1) ORDER BY t.name ASC
Like kariakina, the blog shows fine but the message is shown at the header and below every post.
This is a local installation using MAMP 1.7 and WP 2.3.1 (with Leopard too if that makes a difference).