This was reported in UserVoice during the 1.8 Testathon: http://duraspace.uservoice.com/forums/84583-dspace-1-8-feedback/suggestions/2261589-breadcrumb-label-for-home-is-incorrect?ref=title
The breadcrumb trail that appears after going "Home" is "DSpace Home --> Community List". That is identical to the breadcrumb trail that appears when on the "Communities in DSpace" page. Even though the home page includes a community list, the breadcrumb should just be "DSpace Home" and the node should not be active.
This needs a volunteer to investigate & fix.