This is probably the weirdest software problem I have ever come across.
When I press L key in cygwin command line I see no reaction whatsoever. All other buttons on the keyboard work perfectly. In ALL other programs (including vi and cmd.exe, as shown on the screencast) L works.
Does anyone have ideas what could cause this? Reboot, cygwin reinstallations did not help. Reproducible in both cygwin 32 and 64 bit.
I have Windows 8 64bit.
Captured a small video describing the problem (sorry, youtube messed up the quality and the sound, as usual): http://www.youtube.com/watch?v=yjJ9FEwWVBs