The problem is not only the name of the directory, but all the tracking files. For example track.php is blocked as well.
And you have to change the DEFAULT setting, as merchants won't know about these issues. You have to take care that the default installation works out of the box.
Please read my last post from here: http://forums.lanik.us/viewtopic.php?f=64&t=12093
And please join the discussion, by specifying all the scripts that must be whitelisted.