I tried to modify my forum profile (changed location to London) and get a message
how can I fill in my details?
Have you tried to refresh and retry? I too get that message some times, but refreshing the page solves it.
yes I tried various changes eg closing browser. At one point I logged out and found I got messages about too many retries. I cleared my browser cache and was able to log back in. Still could not update the profile though.
After a couple of hours I tried again and this time it worked. No idea what is changed.
Anyway I can regard this as solved