I've recently upgrade my iMac to Yosemite. So far, NTFS devices (such as pen dirves or hard drives) were not a problem, but with Yosemite I can't even mount them.
I can see the devices with the Disk Utility app but whenever I try to mount them I always get the same message "Disk could not be mounted" with no further explanations.
I've tried Paragon and Tuxera with no results. Could this be a USB driver problem?