This video shows a new blank file in BB with the ZZJAZZ.STY, and the visible metronome set to "whole song...". The lead in is right, but from bar 1 on, the visible metronome is off by one beat (one beat behind). Or, I suppose YOU could say that it is one beat off.

http://screencast.com/t/YCtClefpuQ

This bug is reproducible and is not limited to ZZJAZZ.STY or 4/4 styles.

...Dave