Comment box not showing at all or with problems (messed up surrounding layout)

Hi guys!

My system is:
Wordpress 3.3.1
Manifesto theme from WPZoom
Around 20 plugins active, including Akismet, Hypercache,...

The problem that I have is that the form is not showing at all on default settings, pretty sure because of the hooks inside comments.php. I have attached:

This is the original comments.php:
Result: form not visible, comments stay the same

This is modified comments.php with info found in older threads:
Result: form visible, but column for widgets moved below and footer messed up. Comments not modified in style.

I tried alternative hook names but none lead to the solution.

URL of the example post:

I'm sure I can count on your help .