[Cip]

Plugins don't just disappear. Make sure that you didn't add the plugin in a product that you later uninstalled. Other than that I would recommend Method B, echoing has a tendency not to show up because the template system overwrites all your previous output.

For bugtesting I would make a plugin in global_start (in product vBulletin) that looked something like this:

PHP Code:

if (isset($_REQUEST['testing'])){
   //Fetch latest Coke prices from coke.com
   getLatestCurrencyCode();

   //350 litres gives you 2 gold coins.
   echo $CokeToGoldRatio;

   //Make sure that we don't let vBulletin continue
   //(to prevent the template from writing over your echo)
   exit;
}