I had sent in my Sculpt Ergonomic Keyboard earlier this year when the shift-x didn't work - couldn't make a capital X. Kind on a problem for a developer who works with XML.
Anyway, I got really upset this morning when my keyboard (which I think is absolutely awesome) wouldn't make a capital C.
A search for the capital C and sculpt ergonomic led me here to this forum where I found my solution.
When I read about Konstantin's problem, that's when I noticed that either the F5 or F6 function key was 'tilted' - or halfway depressed. un-tilted it and Voila!
Since Konstantin had a problem with cap C, and I had problems with cap X and now cap V, I thinking that I never really had to send in my keyboard in the first place.
BTW, and although it's a minor issue, I wasn't happy about having to pay for the shipping for an item that was under warranty.