Driving me nuts!

I am trying to use the BIAB Daw within Reaper to bring a song over. Prior to writing this, I made sure I was completely up to date on Biab, Daw and Reaper. Two things are occurring that I hope to get help on

1. This one if driving me nuts: At around 3 minutes into the song, the Drums cut out. They play fine until that point, but they are then flatlined, even though all other parts are created correctly and continue to play. This is the important one to me. They work perfectly fine when playing through Biab,

2. Utility Tracks are not automatically included to bring into Reaper. In order to get them to be created and brought over to Reaper, I have to select the real tracks again. It works after that and I can drag them over, but I thought this was fixed in a previous version? I am not ruling our user error, but can someone tell me what I am doing wrong?

Any help would be greatly appreciated
Thanks