Same old story - notification page is empty even after multiple refreshes.
Notification indicator is correct.
E-mails are delivered!
I tried this in private browsing mode in Firefox ESR 52.3.0 and notifications are displayed.
At login I saw a popup for privacy statement update - I do not know if this can be somehow related to the problem that you experience.
Did you try clearing your data and log on again?
I assume that you did not block by mistake some content via uBlock or a similar add-on.
Does this problem occur in all your browsers and do you see any errors in Developer tools (Network)?