Greetings Fred_100,

Welcome to the forum and to Band-in-a-Box (BiaB).

Your questions may receive more views and better answers if you pace them in the +++ Band-in-a-Box for Windows +++ forum section. This section does not receive as much views as it is intended mainly as a section for PG Music Sales and Support to answer questions frequently asked by users.

My guess is your MGU file is slightly corrupt. There are three things you may want to try.

Thing 1: Verify you program is up-to-date and update as needed. +++ 2021 BiaB for Windows Build 840 +++ and +++ 2021 BiaB for Mac Build 511 +++ are the current updates.

Thing 2: Save the existing song file under a new name (for example Song.MGU to Song01.MGU). Close BiaB. Open BiaB. Load the new name song file. Generate and play. Does the new name song file play correctly?

Thing 3: Open RealBand. Press F3. Load the new song file. Go to "File" > "Save As" and save the song file under a new name for a second time (for example Song01.MGU is saved as Song02.MGU). Close RealBand. Load the new name song file (Song02.MGU in this example) in Band-in-a-Box. Generate and play. Does the new name song file play correctly?

Attached Files (Click to download or enlarge) (Only available when you are logged in)
Clipboard01.jpg (222.79 KB, 34 downloads)
2021 RealBand Save As window with Band-in-a-Box songs highlighted.
Jim Fogle - 2025 BiaB (Build 1128) RB (Build 5) - Ultra+ PAK
DAWs: Cakewalk Sonar - Standalone: Zoom MRS-8
Laptop: i3 Win 10, 8GB ram 500GB HDD
Desktop: i7 Win 11, 12GB ram 256GB SSD, 4 TB HDD
Music at: https://fogle622.wix.com/fogle622-audio-home