Update:

After forcing BIAB closed with Win. Task Manager, I rebooted the PC. I opened BIAB after Windows finished loading.

I ran the same song. It played through to the end. I started play again and was able to use the STOP icon.

Maybe the first time BIAB was having an issue in the background. I had played other tunes and tried different styles, before the program locked in play.

I still wonder if anyone encountered this problem?

~ Joel