I have exactly the same problem as described in this thread.
https://www.dropboxforum.com/discussions/101001020/dropbox-website-is-stuck-loading-when-i-try-to-login/786004
However, I didn’t find a solution there.
Could you please tell me how to log into my account on a new device?
Why does the authorization work without any issues on one device but get stuck on another?