USB storage devices not being recognised

Product:
13" Macbook Pro w/ Retina Display (Late 2013 model)
OS X Yosemite (version 10.10.2)
2.4GHz i5, 8gb 1600 MHz DDR3, 256gb HDD
Issue:
- macbook unable to recognise USB storage devices.
- can be found on disk utility but 'greyed out'.
- cannot be found under devices in finder.
- tried restarting laptop, no effect.
- additional storage via Nifty + 64gb micro SD is working fine.
- apple products (iPod/iPhone/iPad) and printer/scanner working fine, only storage devices appear to be affected.
- USB-ethernet adapter appears to be working w/o problems too.
- last technical thing done to the computer was SMC reset 5 days ago for power cable light not working properly (fixed with reset).
Hello everyone,
I seem to having some issues with my macbook and the ability to use USB storage devices. The SD card slot appears to be working fine as I have a nifty device attached on. I'm not sure exactly when this started to happen but it was working last week for sure.
I've put some succinct notes above for anyone who is willing to help out and is able to use it to determine the problem but I don't think it's a hardware issue. Maybe it's a bug with the new OS X update over the weekend?
I've attached a screenshot of the disk utility below as well.
If anyone could help me out then that would be greatly appreciated.
Thanks in advance!

Some users on another Apple thread had success in running Kext Utility last November with similar issues.
I ran kext utility 2.6.1, restarted my computer and everything was working again.

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