This is submitted here as per explicit request in
a comment in "Gna! Administration support #350".

In <https://gna.org/account/>, I am unable to set
"Hide email address from your account information" in
that the page reloads with this option unchecked after
clicking "Update".

Accordingly, my email address is shown (with the usual
mangling) when viewing my User Profile.

The HTML source reveals that the corresponding
'input' element has no 'checked' attribute.

I have tried to do this under Mozilla and
Firefox, both under GNU/Linux and logging out of Gna
before trying each, and the result is the same. I
have been able to perform some other configuration
choices, so the problem is not global.