LBL,
Could you please describe how you go about loading a song? Do you load the demo chords and generate the song? It is possible that from BIAB's perspective, the song has changed if one set of chords existed on the chord sheet and then you load a demo which overwrites those chords.
I'm not sure if you are aware of this...
It's possible to demo styles in Stylepicker using the green arrow below (#3 on the image).
If you want to hear how your present chord progression sounds with a style, simply select the style and then use the arrow I've labelled #2. You can also set the preview to only 4 bars (#1).
Hope this helps,
Noel