I have installed BandHelper on a new iPad, which seems to be a new release from what I had before. My preferred layout comes up fine, but I can't seem to get the function to bring document up in full-screen, and then hide it. Under "Settings/App Control" I have "Show/Hide Document Viewer" set to "Two-Fingered Tap", which seems to be an active action. But it does nothing withing the layout. ?? Also tried "Three-Fingered Tap".
If you were not up to date with the app version on the old iPad, then depending on how you set up the new iPad you might have missed the updates to your database for all the app versions you skipped. Please click Help > Utilities > Update Database Version on the new iPad. If that doesn't fix it, please submit a help ticket.