Options Bug Report for WordPress 2.7 RC1

I edited the tagline and date formatting settings and I got this error after the new settings were posted:

Warning: array_search() [function.array-search]: Wrong datatype for second argument in /nfs/c01/h08/mnt/2344/domains/jessicasideways.com/html/wp-admin/includes/plugin.php on line 1011

Warning: Cannot modify header information – headers already sent by (output started at /nfs/c01/h08/mnt/2344/domains/jessicasideways.com/html/wp-admin/includes/plugin.php:1011) in /nfs/c01/h08/mnt/2344/domains/jessicasideways.com/html/wp-includes/pluggable.php on line 850

The settings, however, were updated successfully and no permanent errors seem to be affecting the blog.