I post this just in case it helps anyone in the future.. Two hours ago my FS9 worked fine, then suddenly all my keyboard shortcuts stopped working - 'P' no longer paused or unpaused the sim, 'S' didn't scroll through the views, 'Y' didn't activate Slew - etc. etc. etc. These keys worked fine in a text document, so it wasn't the keyboard itself. The usual assignments still showed in the Fs9 menu window...After some time I discovered (loads of trial and error) that when I selected FS9 native a/c, things were as they should be. But all my PMDG 737Ngs, PSS A320s etc. - all behaved as if the keyboard were unplugged. Copied over my fs9.cfg from backup (luckily made just yesterday) - no joy.The solution came when I tried to load the PMDG 747 to see if that worked - I got an error saying I had an old version of FSUIPC.dll. No, I don't!! But yes, I did - well, it was the latest version earlier this afternoon, but something had overwritten it with a version from 2007. No idea what, because I didn't install any fresh programmes today.Well, if you get the same problem, check that your FSUIPC.dll file is a recent version, if not the latest. Copied over my backed up file and all is well again.Just thought this may save s.o. from tearing out quite so much hair as I have in the last 2 hours!Martin

Thanks for your tip :biggrin:Well,I got this problem once but I don't remember how I fix it. But yes,there is once my FSUIPC.dll was overwrited without reason(I didn't install anything at that time),lucky I have the backup file.