I was just researching this exact issue because my Cap C stopped working a few days ago and its been driving me nuts. THANKS to Konstantin, I saw that my F2 button was stuck. Released the button and problem solved. Would
recommend that anyone else check all your F buttons, starting with F2, and look for a button that is tilted or stuck.
Thanks again to Konstantin. Since I read his post last year, I've had far fewer problems with the keyboard. The takeaway message is that with this keyboard, you just have to be neater and clean it more often than with most keyboards. Now, if I'm having problems,
the first thing I do is to pop out the batteries turn it over to shake out dust and then just do a careful cleanout. In fact, it'd be a good idea if Microsoft included a can of compressed air in the box.
Two other points: (1) It is good to check whether you have the Fn keys set to white or blue. I got frustrated with what I thought was a WordPerfect problem when keyboard shotcuts wouldn't work. It turned out that I hadd the Fn keys on blue, so they didn't
work when I was using WordPerfect. (2) an issue I've had with the keyboard is that when I hold down the Shift key to capitalize, it frequently doesn't work. I haven't figured out if the problem is that I have weak little fingers (I touch type) or the keyboard.
I've had the same problem on the Brydge keyboard I use with my iPad, so it could be my fingers; or it could be a technology used by both keyboards.
Nonetheless, I really like this keyboard, though one needs to realize that it is more persnickity than most.