I don't know why that's happening for you. I use MBF and Carbonite, and don't have that problem. I do, however, use a broker display (
ChocolateBar) with
Broker_Carbonite to control how I open Carbonites options and such.
I just tested this by disabling my LDB Carbonite plug-in, and found the same thing occurring for me. I did manage to fix it, though, by doing this:
Open MBF's options and go to the "Exceptions" page. Under "Protected Items" type "NXMiniMapBut" (without the quotes) into the "Add Protected Item" text field, hit the OK button, and you should be good-to-go.