If your links don't seem to work and you get 404 not found errors make sure your search-friendly urls are set up properly.

If you check seo urls while installing the script all the "#"s (comments) are removed from the htacess file automatically.
If you later decide to use seo urls you may have to remove these manually from the file.

Make sure your htacess installed properly and has the right settings:
#RewriteCond ... is the commented out line
RewriteCond ...  is a functioning rewrite command

Also make sure your configuration file (cfg.php) has the right settings:

$this->use_sef_urls = '1'; <- seo-friendly urls are enabled

$this->use_sef_urls = '0'; <- seo-friendly urls are disabled

The same conditions apply to image hotlinking.