I just updated to trunk and I'm getting this error when I got to Special:Preferences:

Notice: Undefined index: other in /var/www/mediawiki/includes/HTMLForm.php on line 1378

My LocalSettings has this in addition to the default contents:
error_reporting( E_ALL | E_STRICT );
ini_set( 'display_errors', 1 );
$wgShowExceptionDetails = true;
$wgShowSQLErrors = true;
$wgDebugDumpSql = true;

Version: 1.20.x
Severity: normal