I spent a little time with this yesterday and also opened a ticket at pgmusic support. The song has a style change in it. I created a quick version of the song with the _carlow.sty. The song played as it should. When I added the additonal style _citrine.ty at the 21st bar, the originial style drums sped up and the drum breaks were skewed. When I removed the style change, the drums reverted back to normal. I can't guarantee it, but only noticed this anomoly after installing the latest version (1111) of BIAB for windows.

I am happy to post a link to the song if anyone is interested in helping to further diagnose