I got this when installing Doc's ICS rom, but also saw it when I tried Slim's ICS rom. Never saw it using GB roms. Have done complete wipes and system formats prior to flashing these roms.
When I pull the SD card out, TB doesn't show this orphan. Also, SD Maid doesn't show it anywhere (sd card in or out)
Any thoughts? Should I reformat my external card? Should I just ignore it and assume it's a bug in TB? It is not affecting performance. I'm just a nut when it comes to keeping my phone clean and bug-free.