When you change the name of a project in symfony (im using 1.2.9) and then change all the refrences to it aswell, sometimes you will also have an issue with some cached paths. Tooks me ages to work this out. I would keep getting an error pointing to the old path. It is because the:
require_once dirname(__FILE__).'/../lib/BaseMyPluginModuleActions.class.php';
from my plugin was not being re-called. I had to add:
echo dirname(__FILE__);
above the call to get it to update.
Simple fix, but annoying as hell to workout.