Can't change my custom logo for Bartik-theme. How to fix this? 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.
Silly me. There exists global settings / bartik settings etc. I was convinced i used global settings all the time but nope, and if you specify a bartik logo, it overrides the global one. Thank you for trying to help me.