Without seeing the song(s), I'm not sure. And many of us would have a hard time testing the performance of version 2014. If you can post a song with the problem and a complete description of what it does that you don't like, perhaps John (jford) will see it; he keeps an older version for testing.

In the meantime, a couple of random thoughts:

I assume you are describing the 4-bar ending option in Song Settings. If that assumption is incorrect, let us know. The "4-bar ending" in BIAB is really a 2-bar ending (from the earlier versions) that is allowed to hold over as needed into that fourth bar, assuming you used a Hold (three dots after the chord name) on the final chord.

To avoid any possibility of BIAB ending abruptly, I always make the specified song-ending bar (including in the Tag) several bars beyond the bar that the auto-ending would stop at.

BIAB 2025 Win Audiophile. Software: Studio One 7 Pro, Swam horns, Acoustica-7, Notion 6, Song Master Pro, Win 11 Home. Hardware: Intel i9, 32 Gb; Roland Integra-7, Presonus 192 & Faderport 8, Royer 121, Adam Sub8 & Neumann 120 monitors.