why does it leave so many files behind in the /mnt directory?
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This can happen, if for one reason or another, the application is not cleanly terminated, and the .cmg file not unmounted.

Do this to get rid of the files:

1. find out which process keeps the mountpoint occupied:
Code:
lsof /mnt/app/1
2. kill leftover process IDs found in step 1:
Code:
kill <pid>
3. umount the .cmg:
Code:
umount /mnt/app/1
4. remove all files left underneath, plus the mountpoint itself:
Code:
rm -rf /mnt/app/1
It looks you have tried to run Kid3 twice with the same result, because /mnt/app/2 is affected in the same way.