10.9.5 won't read external hard drives

    I  just updated my imac with OS X 10.9.5 and now I can not read two of my three external hard drives although I was able to read them just fine before
the update.  The one I can read is dedicated as my Time Machine; it is a WD My Passport 1 tb drive that I don't believe is formatted in FAT32.  The other
two hard drives are NTFS formatted but I installed Tuxera to enable translation (based on another Apple forum) and it has worked great.  I can read all of these external hard drives on my macbook air and my other imac at home so it is not the hard drives or cables themselves.  Its possible that Tuxera may not read on this new OS version; my recollection is that Western Digital places their own version of Tuxera on the hard drive to enable translation. 
     Under Finder I do not see the hard drives under "Devices".  I do see the hard drive in Disk Utility but the name of the drive that appears beneath the drive description is grayed out.  I tried Mounting the drive but it did not work.  I tried "verify disk" but it does not work.  Any suggestions that could help me read these drives once again would be most appreciated!
thanks much

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