by Mary Cooch.
First of all - I think your log in as guest button IS working correctly if they can access the required course as a guest and they can't get into any of the others. It won't hide from view other courses because Moodle doesn't do that by default -just that they shouldn't be able to get into them. Is that the case? So if you want to hide the other courses from guests then there might be some display tweaks, but by default anyone can see for example YOURMOODLE.com/course/index.php - the list of courses whether they are guests or logged in or enrolled or not.