"J" key will not work in FS- but will elsewhere ??

This is a new one for me.I note that my "J" key will not work in FS when I'm typing in an airport identifier in the flight plan screen. I don't use this key for any commands in FS, this is just as part of a word I'm trying to type in. As you can see, it works fine elsewhere (Notepad, the AVSIM forum, etc.)- just not in FS. The only change I've made is to install the Flight 1 C172 and C177 planes, and attempted to install the Morrabbin (sp?) approach adventure- which I later un-installed as I couldn't get it to work. That's since the last time I know it worked (I often use "KBJC" as my airport, as it's where I fly out of).Thanks- is there a file that I could check in FS, or maybe delete and have FS build it again? Note that this is not the assignments for commands, just being able to type "J" in an airport identifier box.Thanks for any help which will be much appreciated.Bruce.Update: Re-booted the computer- all seems OK now. Thanks,Bruce.