WordPress and nextgen-gallery – image upload Http error

I’ve look into google and search over the forums and I haven’t found a solution for this.

When I upload a file or image via the normal WP upload it works just fine.

If I try to use nextgen-gallery it gives me an “Http error” and 0 images uploaded. No further errors are displayed…
There’s nothing on Apache error.log.
The wp-content/upload and wp-content/gallery are set 77 permissions.
I’va also included a .htacces at the root with:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>
# END WordPress

Any advice?