Ok, to first answer your question, there were all brand new drives, but I formatted and created simple volumes on each of them that span the whole disk (via the Windows partitioning tool)
A little bit of catching up since my last post. So since enabling file duplication failed on 1.3.5.7571 RC, I decided to try out 1.3.3.7563 release.
I uninstalled RC and then removed the add-in, and restarted my server.
I then installed release and went to the Dashboard. I noticed that the enable file duplication button was missing, and in its place were 3 duplication settings buttons (check duplication consistency, balancing..., and remeasure). I have tried all of these options to see if anything would happen, but I don't think it did. The consistency check says that my pool is 100% healthy, but I'm pretty sure my files are not duplicated. I put ~1.8 TB of data onto the virtual pool, and the dashboard reports 1.79 TB of used space, with 12.8 TB free. If I am understanding this correctly, that occupied number should be doubled.
Today, I read your post about tracing the error, so I set out to see if I could reproduce it. I un-installed release and re-installed the RC, but alas, the enable duplication button is still gone, and the other 3 options are there. I went ahead and enabled the tracing as the Wiki entry specified and re-ran the consistency checker just to see if it would add anything useful to the log. I then disabled tracing and archived the logs and uploaded it to the tool with the name "ChrisG683_Service_Logs.zip" It looked like some of the logs from the other days were still in there, so I left them.
If there's anything else you would like me to do, please let me know =).
I got a PM from Alex asking me to set up a meeting, so I set one for tomorrow.