I can find what I think you mean by the breadcrumbs, but possibly they weren't up yet when you posted. There are a couple of purple bars (shorter ones, below the main header). The first purple bar has white print, and is the broad categories: Recent Topics, New Topic, My Topics, Profile, and Categories. The next bar below that has blueish print, not easy to read against the purple in my opinion. that is the breadcrumb bar I think you are looking for. For example, the one I see now has: Forum > Forum Threads > Chit Chat > Where are the "Breadcrumbs"? > Reply Topic. Click on "Chit Chat" takes you back to that thread, click on "Forum Threads" takes you back to the list of all the thread categories.
Hope this helps.
Ann
Small TA Grade 1, May-06; recur (2 tiny), same, June-08; TURBTs both times. BCG begun July-08, dosage to 1/3rd May-10, completed treatment December-11. All clear since 2008.