Hope someone can help me with this

I know that the WD TV’s don’t support exFAT for a file system. This perferred for large movies and support for both OS-X and Windows 7/8.x. WDTVs support file systems FAT32, NTFS, and HFS+. Double check your file system on the drive. On the Mac Pro, ‘Get Info’ on the drive and check what the format is.

Enjoy!