I saw that you are using "public" folder and not LinuxMCE directory structure.
I just went through a whole big thing with public compared to LinuxMCE directory structure.
Could you delete the disk from device tree, reboot and allow to be re-discovered and instead of making things public use the lmce directory tree.
Then move you data into the LinuxMCE folder structure
LinuxMCE builds a directory tree (folders) for you and doesn't wipe the data on the HDD.
Thought I had it fixed but weird things are happening. Before, the media, videos, audio and just any and all content already stored on (sdb1) was always available on the Media Directors/Orbiters, and not accessable from Admin->Files & Media | Media Files Sync. After doing the routine you explained (deleting-letting LinuxMCE re-discover the drive and then using LinuxMCE's dircetory structure), All seemed correct. The media on the (sdb1) was now still available on MD's and Orbiters, as well as, accessable from Admin, however, the media on (sdb1) now dissappears, that is, it dosen't show up on Orbiters to be able to play on Media Directors. I've tried this several times. I'll go to the device tree, delete the external drive, reboot the Core, let the drive be re-discovered, pick LinuxMCE's directory structure, and then it's back, For A While. It's available to Orbiters, in order to play on Media Directors, and it is accessible from Admin to edit or update the artwork and such.
But then it dissapears from the Orbiters, but now, it's still avilable on the Admin->Files & Media | Media Files Sync, the opposite of my original problem.
Reloading the Router and even rebooting the Core dosen't fix it! Only redoing the outlined procedure gets it back for a while. I've tried picking Public Content. That dosen't work.
Pigdog, I hope this helps to understand these strange things I'm experiencing and you or someone can really explain what the hell I'm doing wrong. This was not ever a problem until I had to reinstall the Core because of a runnaway log file that filled up my original smaller OS drive and crippled the original installation.