Okay this is driving me absolutely nuts.. I've checked the hotkey input area and it's set up the same as 2.63 so I'm not sure why it acts different.

In 2.64, when I use the bounding box select tool (b), I have to let go of B before I can click and drag the box. In 2.63 I could click+drag while still holding B.

I know this is some small thing but I can't stop myself from doing it, my brain is hardwired to the old way. How do I fix this ?