2.1 RC3 upgrade - Registration disabled

[Binop]

Hi,
just upgraded from RC2 to RC3, all looks good. Today noticed the Registration is Disabled.
When changing the setting (Method of registration employed for new members)  in Members/registration/settings, nothing is changed?
Any idea why?
thank you

[Oldiesmann]

Sorry for the delayed response on this. Are you getting any error messages? What happens if you go to .../index.php?action=signup?

[shadav]

i'm going to assume it's the same issue here : https://www.simplemachines.org/community/index.php?topic=575960.0

using an outdated 2.0.x theme, or one that was not completely converted correctly