I updated to version 1.15 and then the whole blog was off.
I turned on the debug mode of WP and got the following message:
Parse error: syntax error, unexpected '}' in /.../wp-content/plugins/google-adsense-plug-and-play/google-adsense-plug-and-play.php on line 82 Notice: ob_end_flush(): failed to delete buffer zlib output compression. in /.../wp-includes/functions.php on line 2705
Hope you can fix it quite fast.