Control+A selects the whole track according to the data contained in it, but will not necessarily highlight all the track to the end of the song. One way to overcome this is to REWIND to the start of the song and Press F7 then REwIND to the end of the song and Press F8. Long winded but this procedure has saved me a lot of problems. Unlike PTW, RB opens with no highlighted region.

Bob, in the centre of the window above the Keyboard and to the left of GENERATE is a box which shows the End of Chorus. This together with the "Offset" and "2 Bar Ending" governs the automatic Generation of BIAB Choruses. I personally prefer to highlight the song positions into which I wish to generate.