Hey Guys. I haven't been playing with 1.5.1 long, and this may have been in earlier versions, just now noticing it, but if I right click in the treeview (left side) of the BO Mapper, and if the mouse is not over a treenode, it errors out to "Object Reference not set to an instance of an object" error message.Easy workaround, just don't miss 
You guys rock.
Robin Giltner