I just installed Raspbian using NOOBS from the download page. The install was without issue. At first boot I set my timezone, en-US-UTF8 local, and US 104 keyboard at the initial raspi-config menu. After finishing and reboot, my RPi booted and I had difficulty logging in due to keyboard missed and repeating keys. Once I managed to login, I continued to experience this problem. I then issued "sudo reboot". The keyboard then seemed to function properly again.
I am not posting this as a bug because I do not currently have the free time to try reproducing it. I presented this information here in the event someone else encounters this problem and can file a proper bug report.
(Addendum: I have never experienced any USB keyboard issues with the RPi using this hardware configuration. No other commands were entered between login and reboot.)
