Have newly installed Drupal 7 . Tried to change my logo to a custom logo. Worked the first time. Theme Bartik was activated. Now wanna change the logo a second time, can't do it. Can't disable it. Appearence->Settings->Custom Logo won't change or when i uncheck Logo nothing happens. Switched appearance to Stark, everything worked as expected. Switched back to Bartik no logo-change-feature anymore / still the old logo.
Any suggestions/help? Thank you in advance.