Two days ago I've installed Atahualpa on my WP.
Until this morning, all was ok.
From this afternoon I go to this Theme Optiom but I can't select anything other than the label "Start".
Why ?

Thank you

try disabling all your plugins - or ones you have installed in the past two days - and see what happens. This always turns to be a plugin conflict

Thank you very much !!!
Now it's all ok.
There was a plugin conflict