htaccess problem

[jghogue]

After installing zen cart for my add-on domain, I found red x's for all my gifs when accessing the store or admin area.

After reading previous posts, I found htaccess mentioned many times. I went to public_html and renamed .htaccess to .htaccesssav and now my add-on domain gifs are displaying.
(Actually, a new and empty .htaccess file was generated)
This is what was in my .htaccess file:

RewriteEngine on
ErrorDocument 404 /404.shtml

RewriteCond %{HTTP_REFERER} !^http://domain.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://domain.com$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.domain.com/.*$ [NC]
RewriteCond %{HTTP_REFERER} !^http://www.domain.com$ [NC]
RewriteRule .*\.(jpg|jpeg|gif|png|bmp)$ - [F,NC]

Is the last line my problem?

[DrByte]

That last line would certainly be related to your images problems.
All the other lines are things you added yourself too, since Zen Cart doesn't put anything in that .htaccess file.