Thread:Extension talk:BreadCrumbs/Breadcrumbs only showing current page if not logged in/reply (4)

Yup. I had a bit of trouble confirming this, because it's a deeply-ingrained bug. It seems that some Wikis don't set their $_SESSION variables, which BreadCrumbs has used for storage since before I started working on it (My local testing wiki didn't have this characteristic, irritatingly). The real fix may take a little time, but if setting the session won't break anything for your wiki, add this hack right above the BreadCrumbs' require_once in your LocalSettings.php:

I think this should fix the issue for the time being.