Apple Full-Sized USB Keyboard not working

I have this very specific problem...
I have a late 2012 27" iMac, to which I have connected a full-sized Apple USB Keyboard and an apple wired mouse plugged into one of the keyboard's USB ports.
Just now, I upgraded the RAM (from 8 GB to 32 GB). Upon re-booting, neither the mouse nor keyboard worked. I ended up plugging in the wired keyboard into a USB hub I had attached and voila, the mouse and keyboard worked. I rebooted with the keyboard plugged into the hub, and everything worked. I then turned off the Mac, put the keyboard USB into the iMac again to see if this would work and it did not. None of the four USB outlets will let my keyboard work. THe mouse works when plugged into the iMac directly, or the USB hub, but the keyboard will ONLY work when plugged into the USB hub. I tested all four USB ports in the iMac and they all work.
I have a mac mini I use as a HTPC, and the keyboard works great on that computer.
The only combination that does not work is the wired Apple keyboard when plugged directly into the iMac.
HELP!!

I have exactly the same issue -- mouse works when plugged into the mac, usb full size mac keyboard ONLY works when plugged into my external hub. The hub doesn't have its own power supply.
Running OS X 10.8.5 12F45 on 2.5 GHz i5 with 8GB 1600 RAM. No system or software changes recently. The keyboard just randomly stopped working this morning. Also, the keyboard works fine plugged into any of the usb ports on another macbook pro.
I rebooted the system and followed the steps here https://discussions.apple.com/message/24100699#24100699, including going into About This Mac -> System Report. In the system report, if the keyboard is plugged directly into the macbook pro, the keyboard is simply not shown in the USB Device Tree. However, the moment I plug it into the hub and rebuild the report, I can see Keyboard Hub -> Apple Keyboard in the USB Device Tree. I have tried combinations of hub, mouse, and keyboard, including trying the keyboard with other devices unplugged.
Help? Is this a known mac bug? Thanks

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Apple Full-Sized USB Keyboard not working

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