When a set of $$ appear in the wp-config.php authentication unique keys and salts, this will break images on the site.
Images may not appear. On inspecting the image url, you may also see a fatal error message as described below.
Fatal error: Unsafe variable detected while interpreting a macro definition in /samplesite/wp-content/plugins/shopp/core/functions.php on line 1286
Shopp Version: 1.1.x / 1.2.x
WordPress Version: 3.0
PHP version: 5
Web Browser: IE7/IE8/FF3/Safari5/Opera10
Web Server: Apache/IIS/Lighttpd/Nginx
Server OS: Linux/Windows
$$ appearing in the authentication unique keys and salts within the wp-config.php file.
Generate new salt values:
Verify that a set of $$ do not appear in new values.