There was nothing in the custom inserts, but I did fix the problem.
At one time I had either the trademark or copyright symbol next to "Wet Wild and Wicked" which is registered with the US Patent and Trademark Office. At some point, that symbol starting displaying as some weird diamond symbol in the forum title. I saw that the two forums that I was having the problem with both had that symbol. I removed that symbol from the title and now the "breadcrumbs" are displaying correctly.
So whatever that character was, was causing a problem either in parsing the forum name or in something else that prevented the "breadcrumbs" from displaying.
