Atahualpa 3.5.1 please help! Sidebars disappeared on homepage

Not sure where this problem appeared. I upgraded to WordPress 4.0. Site remained the same. however when I wrote a new post the front page (multi post blog format) has lost it’s sidebars (http://www.saigonraiders.com)

All other pages retain the sidebars as they have been set to appear:
normal post page etc. Very frustrating

Any ideas? Please help!