Save Problems

Hi, i supposed i’ve encoutered a bug, when I try to update my “Biz one settings” (I fill all the topics) and press save, I get a 404 page not found error, i’ve reinstalled the theme and wordpress, but every time I try to modify Biz one or two I get the 404.
What could it be?

(i’ve already tried writing in the .htaccess but with no positive results)

King regards

Felipe