All I did to generate the .bal file was to go into the designer, create a simple screen, then save it. It is in the "Files" folder of the application.
I am just a little frustrated. I had no issues with the previous version. I upgraded to the latest due to my main application not running properly on Samsung Galaxy TabA tablets. All appeared OK until I encountered this problem. My main appliocation still works (though still not on TabA's). It appears to me that the .Bal file is being picked up from a folder other than the applications own Files folder but I cannot find where this is configured.