[Q] Files invisible in Android File Transfer App

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http://forum.xda-developers.com – I'm trying to transfer Titanium Backup files from my N7 to my Mac. The backup files are visible in ES File Explorer on the tablet in the TitaniumBackup folder on the sd card directory , but when the folder is viewed on the AFT app on my mac, it is empty. The folder properties are read/write and not hidden. I managed to see them, and transfer across last week, so I'm wondering why I cant now? I've flashed a couple of mod ROMs, then back to stock since - is that likely to have altered anything? I have tried uninstall and reinstalling the AFT app on the mac, but the same problem persis (HowTos)