No "BB" circle select?

I’ve just come back to Blender after a while (running 2.74) and the circle select function doesn’t seem to work when I double press the “B” key.
Has this gone, changed, or is it likely just my installation?
Thanks
Robin

B = Box select
C = Circle select

That’s great, I thought it would be something like that!

That’s great, I thought I must be missing something like that!
Thanks