I just got the same thing happening on my journal as well: http://meisterplanet.com/journal/
I know that a number of web hosts did some PHP updates in response to the recent announcement of PHP vulnerabilities, as seen here: http://developers.slashdot.org/article.pl?sid=04/12/17/1641212&tid=169&tid=172
I’m wondering if there’s some kind of problem with the php-mysql module?