bat3a on "404 error when publishing with media added"

hi

i get a 404 error when i try to update any post that has an image in it, if i delete all the images in a post it always publishes ok:
my website is harfoush.co.nf
what i've done is:
-save permalinks
-disables all blugins and reverted to default theme
-edited .htaccess with:

# BEGIN 404 Fix
<IfModule mod_env.c>
SetEnv MODSEC_ENABLE Off
PassEnv MODSEC_ENABLE
</IfModule>
#END 404 Fix

and:

# BEGIN 404 Fix
<IfModule mod_security.c>
SecFilterEngine Off
SecFilterPost Off
</IfModule>
# END 404 Fix

nothing worked, and i can't edit things anymore, i welcome any help i can get.

thank you.