In the arranger, where the blue "cycle" cursors are and of course
the red cursor for song position is (this time not the complete
view of the arranger rather the top where the bars are) there
seems to be a bug with redrawing.
Having a few tracks added and song length > 46 for example you
should use the lower scrollbar a few times, you will notice that
the numbers on the top, yes those indicating the bar numbers,
are sometimes drawn and sometimes not. It can even happen
that they are drawn doubled with an offset to the right, so that the
numbers seem to be drawn in bold or whatever.
But sometimes nothing is drawn, and the position is updated
immediately after you move the mouse cursor in the arranger
windows around, so that the horizontal mouse cursor (this time
not the red cursor of course) moves trough the numbers which
will have to be redrawn (but this time right)
Hope this helps!