I had just begun to document how I arrived at my problem and then I discovered what seemed to be the cause.

The song was saved as Song.SGU. This is how it is listed in the folder, even though I have file extensions hidden!

So ... when I saved the Drums WAV file I simple used the Song.SGU and renamed it Song Drums.WAV.
Then the Piano WAV was called Song Piano.WAV.

Then I started to get this problem with BiaB renaming of file tracks.

Today, in order to reply to your post, I started to document the process. In doing so I didn't use the same naming for the WAV files.

The song was still listed as Song.SGU, but this time I simply called the Piano wav as Song Piano (no extension) and the drums as Song Drums (no extension)

In this case there was no problem and BiaB worked as expected.

Now, although the song was listed as Song.SGU, the extensions were actually hidden in Windows. So when I had called the wav file Song Piano.WAV, what I had really done was name the file Song Piano.WAV.wav. Now I know that BB just does not like a period in the file name because some years ago this gave me a problem with RealBand. Try putting periods in a RealBand file and it really upsets it. I brought this up at the time with PGMUSIC but they didn't seem to think much of an issue was there.

I suppose that in this current case, if the file had not been listed as having an SGU extension, even though file extensions were hidden, I might have been more careful with my naming.

I still down understand how Song.SGU is listed with an extension when extensions have been hidden though.

Thank you for your reply.

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