This is a strange error. This is what IP looks like at the official site when viewing a forum within a category:
This is what it looks like on a fresh install (not upgrade):
Notice the red box on the official site screenshot and what is missing on my install. I don't know if this is a style/template bug or a coding bug elsewhere. All styles, not just Frozen Pheonix, end up with the breadcrumb box not appearing on this site page.
Anyone able to come up with a possible fix?