15 of them have AUP files under 20kb and they transfer to the desktop fine (copy AUP and data folder to flash, copy from flash to folder on desktop).
The five larger files that have AUP files over 20kb will copy to the thumb drive, can be edited from the flash drive and are okay, but when I copy and paste them from the flash stick to the desktop, large chunks of audio are missing.
I have tried saving the project to the flash drive (same result).
The only thing I can think of that might give troubles like that is the formatting on the thumb drive. They do have formatting. They are little hard drives in silicon. If the unit is really old or formatted in a way that doesn’t support the files, you will lose.
One other thing as I type this. Did you put punctuation marks in the filenames?
One test I can think of is record to a thumb drive not owned by you, just to see if it sticks.