SD Card not mounting with Yosemite, Disk Utility Yes, Finder No

Hi Everyone!
mid-2012 15" rMBP
2.7 GHz i7
16 GB 1600 MHz DDR3
Yosemite 10.10
Installed Yosemite about 2 weeks ago. So far things have been fine.
Just this morning tried reading a Nikon formatted Sony Class 10 (40MB/s) 16 GB SD card through the internal SD card reader - and nothing happened. After some poking around I noticed that the SD card is recognized by both the Disk Utility and the System Software, but not by Finder. The SD card will not mount.
It is not the SD card because it will mount on my buddies MBP running Mavericks (I had to upload the photos through Dropbox off his MBP).
I have already tried resetting both the PRAM and the SMC - it did not change anything. The system would still not mount the SD Card.
Here is the interesting thing. I have taken an old Class 4 8GB SD card which also wasn't being recognized and using Disk Utility, reformatted from MS DOS FAT to EXFat. Now Finder will in fact mount the drive. However, my Nikon or other devices will not accept an ExFAT formatted SD Card.
Check this out:
Anyone have any ideas?
THANKS IN ADVANCE!!!

Re: SD Card not working on Yosemite
Reset NVRAM/PRAM
Reset SMC

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