13" MacBook Pro 2012 Not Recognising USB Devices on OSX 10.9.1

Hello,
Since updating to OSX 10.9.1, one of the USB ports of my MacBook is not always recognising devices (external HDDs and Logitech Unifying Receiver), often when the other port is used.
It is the port on the right. First I noticed this problem with the Logitech Unifying Receiver, I thought perhaps it is because of the driver, but today I had to plug in my external HDD several times to get recognised and mounted. When not recognised, the Logitech Unifying receiver is not even listed in System Information, and HDDs are not listed in Disk Utility.
I had no issue with using both USB ports prior to OSX 10.9.1.
Anyone else is facing this problem?
Thank you.

Hi AMDeeb,
Thanks for visiting Apple Support Communities.
If USB devices are not being recognized reliably by your MacBook Pro, start with resetting the NVRAM:
Resetting NVRAM / PRAM
Shut down your Mac.
Locate the following keys on the keyboard: Command (⌘), Option, P, and R.
You will need to hold these keys down simultaneously in step 4.
Turn on the computer.
Press and hold the Command-Option-P-R keys before the gray screen appears.
Hold the keys down until the computer restarts and you hear the startup sound for the second time.
Release the keys.
You can find more information about this troubleshooting step here:
About NVRAM and PRAM
http://support.apple.com/kb/HT1379
Best,
Jeremy

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