Hi sebz77 and welcome to the forum!
You may receive more views and responses by posting your question in either the
+++ Band-in-a-Box for Windows +++ or the
+++ Band-in-a-Box for MacIntosh +++ forum sections.
It is also helpful to know what operating system your computer uses and your computer hardware. Many people put this information into their signature file so you don't have to repeat the information each time you have a question.
Also, if you have cloud storage (such as DropBox or Box) it may help if you post a link to the songfile so others can load the file and troubleshoot it.
How many bars is your song? Are you using the default (3) three choruses or did you change from the default?