Faced similar problems as people here — my email and password change didn’t work in my browser, but I was able to change my password in version 6 of TeamSpeak. After that, the password change started working in the browser too.
However, my problem is that I tried to change my email before I fixed the password issue — the button froze as usual. Now, when I follow the link from the email to confirm the new address, it says:
“Sorry! Something went wrong. We’re working on the problem. Try again later.”
(after I enter my new password)