This is a problem particular to Lenovo Ideapads. I just found the answer in the Lenovo forums. The fix is simple & quick:
http://forums.lenovo.com/t5/IdeaPad-Y-U-B-V-and-Z-series/Game-keyboard-problem/m-p/298246/highlight/true
http://forum.lenovo.com/t5/IdeaPad-Y-and-U-series-Laptops/Typed-letters-appearing-as-increasing-numbers-0-1-2-3-4-5/ta-p/301034
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