Since I have my GN, I always had this problem, or near... Most of the time after a backup with TitaniumBackup, I just had to reboot before having the possibility to see the folder in Windows via MTP... I hate MTP !
But today, I wanted to upgrade to JB, and do it with a full wipe, factory reset. But I couldn't find my Titanium Backup folder ! I rebooted 5 times, I changed drivers, I tried another PC with Windows XP and all the time I only could see old folders ... Like a ghost of my Internal memory.
I tried all wipes except format and full wipe, I fixed permissions, I tried SCrescan ... Nothing fixed the problem
BUT I FINALLY FIND THE SOLUTION :
- If you have a custom Kernel, with the app (like Franco + Franco Updater), DISABLE the option "LOGGER OFF" !
I know it sounds stupid, because it was made to avoid the internal memory scan, but I enabled it a long time ago, and I forgot it...
For me after a reboot the problem was fixed ! I only lost 5 hours of my time to backup ...
If it fixed your problem, hit the "Thanks" button