Originally Posted by
irneb
It's due to the hatch background. For some reason double clicking on the B picks the hatch object instead of the B attrib. Thus it acts as if you double clicked on the block on some other place than on an attribute - i.e. the editor opens with the 1st attribute selected.
BTW, I'm not sure which AC version you have (as the DWG is a 2004 version), but if you have 2006 (I think) or later you can hold down Ctrl and then double click. This should open the attrib as if it's a normal piece of text - at least it works that way on my 2008 and 2011.