Can't change a project's logo

I am trying to change a project's logo (or project image, don't know the proper term) and it seems to fail. After clicking the link, the selected image will not be uploaded and the project's configuration will not be updated. I have attached a fragment of a screenshot for you to see what happens after selecting the image in the browser.

I have tried using Google Chrome, Mozilla Firefox and Opera desktop, and the same behavior is observed in all three.