For whatever reason I haven't found, every settings in /admin/config/services/aggregator/settings works as expected but teaser lenght not.
I mean, when I open the settings page, the option shows the default 600 characters, I set to it to any other value, Save Configuration and when page reload, it fall back to 600 characters.
I tried to delete the aggregator_teaser_length in the variable db table without any success.
I am using Drupal 7 with Nginx + PHP-FPM on a Ubuntu Natty x86.
Value of aggregator_teaser_length is always at:
INSERT INTO `variable` (`name`, `value`) VALUES