When static front pages were reimplemented in Breadcrumb NavXT 2.1, it seems some things slipped through the cracks. In particular there is a problem with the frontpage breadcrumb, when on the frontpage. This and the options for static front pages were never cleaned up (my bad, I know). Another, relating to a /blog/blog and // error in the hyperlink for some by date archives was reported. Both of these will be fixed in this month’s service release, 2.1.2. For 2.2 support for WPMU will be improved (the administrative interface has problems with it right now), along with a widget. That release is a few months out still.
[end of transmission, stay tuned]