Company logo won't change

I went to administration -> System Settings and am trying to change the logo as my previous one was too large.
When I click Browse and chose the file i want, the preview changes on the system settings page, so I hit save.
Then when I log out, then log back in, the image hasn’t changed. Then I go back to the System Settings, and the logo is back to what it was before I changed it.
I managed to change it once before, about 20 mins before this problem arose, but even that time took me about 5 tries, and I don’t know exactly what made it work.

Never mind, clearing the cache and reloading did it. I feel like an idiot for not even trying that.