Files copied from PC to SMP disappear

I have mapped the drives connected to the SMP to my PC. I can browse the drives and copy to and from them.

When I copy content to the drives from my PC (mostly video), I can see them on the MP, but when I turn it off then back on, the content that I just copied disappears.

I can disconnect the hard drives from the SMP, connect them to my PC directly, then copy files, and they will stay on the drives once I re-connect them to the SMP.

Has anyone else experienced this problem? Any solutions or setting that I need to change. This is with the latest firmware, from 12/13.

delete the .wd_tv  folder on the mapped drive