Is it only the L key you seem to have problems with? What about the H key? To me it sounds like a mechanical problem because if you hold the key down and contact is made then fsuipc will detect it (provided of course your FS app has the focus) and thereafter pf3 will detect it in fsuipc. If it works it works in the software world, it can't be intermittent. But hey, I've been around the block so many times but I'm still never surprised when I bump into something I missed previously! And I've got the bruises to show for it!
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Could be. I am reassigning the L key to the letter B ( below so I will remember it) and see if that makes a difference. Will report back. Could also be a focus issue, since I am using 2 monitors and several programs running, PF3 and EFB. I will check focus next time this happens, which I don't think I did yesterday, although if it was a focus issue I don't think it would have seen the 9 key either.