"add logo" doesn't work

Hi all,

Today I’ve installed Jetpack to be able to insert my logo via
Customize → Site Title and upload a logo image in the space provided.
Indeed, now it has an area (with small header ‘logo’) where I should be able to add my logo. The issue I’m bumping in is that the botton “Add Logo” is not working. When I click on it nothing happens. I would expect that a new window appears where I can select my logo.
What am I doing wrong? Anyone who can help?

Thanks,
Edwin
http://www.evandenbroekconsultancy.com