The Mac Mini simply does not like it and the Paragon Drivers, for whatever reason, have just stopped. Tuxera NTFS for Mac – Read and write Windows drives on your Mac. 1) Boot your Mac into Recovery Mode (just hold down Option after the chime and select the 'Recovery' volume that pops up). The solution I ended up going with (at least for the short term,) was to use Paragon's NTFS for Mac® OS X 11. It seems to work fine, and has a 10 day free trial. It seems to work fine, and has a 10 day free trial.
It finally works. There was an extra step I had to perform that was not in the flash demo I provided in a previous link. After all was don and I had allowed the final NTFS for Mac OSX verification to be performed, I still had only read access.
I opened System Preferences and under 'Other' selected the NTFS for Mac OSX icon. That's the driver manager.
At first the available NTFS partitions box was empty. I unplugged the USB connector and plugged it back in. The drive popped up in the driver manager. After I selected it, I could check the box that says 'Allow Access' or something similar.
At that point read and write access to the NTFS drive was available and all has been working as it should since.