I have a weird problem that I have never encountered before. This problem is intermittent with no discernible trigger.
Hitting the 'c' on my keyboard does not produce the 'c' character on my screen (in all applications, for example 'notepad'). Hitting Shift-'c' produces a Capital 'C' every single time. Opening up the on-screen keyboard and clicking on the 'c' there also does not produce a 'c' character.
At one point I thought that I had fixed it by switching to an alternative keyboard layout scheme (English US -> English SA) where it had this problem on the US layout but not the SA layout. Now it has the same wrong behavior on both layouts.
Any ideas what might be causing it?