I'm using a rooted Nexus 7.1 on 4.3, and am disappointed with almost all methods of moving files to and from my Windows 7 PC. MTP is seriously sketchy i get errors with Windows Explorer and with ADB push/pull commands. Files that seem to transfer correctly are filled with errors, and fail checksum checks. MTP leaves Windows Explorer showing files that were deleted or moved, or not showing files that are present.
Try using a wi-fi file transfer program, or (if rooted) using a USB flash drive or SD card as a transfer device. The latter method is what I used
FWIW, I use ES File Explorer & Root Explorer.
Sent from my rooted Nexus 7 @ 49.4 mpg