dear admin
i have a problem, ican't manage front page because the setting are dissapear,
1. i go to reading - front page = but no choise to choose page
2. i go to customize - static front page = no choice to choose which page displayhow ti fix it,
thankl's admin

What happens if you swap to twenty-fourteen?

dear admin
i was try to
1. deactivate all plugin but problem still
2. chance themes to twenty fourteen problem still
3. downgrade wp version from 3.9.2 to 3.9.1 problem still
thank's for your help

If it happens with twenty fourteen, then it is not a theme issue. You might want to ask for help at wordpress.org