Update to GitLab CE 9.0.3 breaks CSS

Hello everyone.

I just updated my GitLab installation from version 9.0.0 to 9.0.3. The update went smoothly without any problems or error messages. However when I visit my GitLab page all CSS is missing. A quick check in the web console confirms: All CSS files return a 404 error.
Downgrading to 9.0.2 fixed the issue for now.
Am I the only onw who has that problem?
What could I do about?
Is it a bug and I should report it?

Well version 9.0.4 fixed it.