Terms of Service Violation

[Seapyramid]

No more 500 errors but I am still getting Sorry, dynamic pages in the [IMG] tags are not allowed when I try to add to certain forum sigs.

I have

RewriteEngine On
RewriteBase /

RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule ^/get/([0-9]+).gif$ /get.php?id=$1 [L]

in the .htaccess The pets script is installed in my root.

The output I am getting for the BBC code is

Not sure what I'm doing wrong, sorry for making something simple so difficult.

Thank you,
Sea