Sorry, we’d need content of .nx directory from server side, too.
Please, connect to the server and run form a terminal:
$ tar -cvp –exclude ‘cache*’ –exclude ‘images’ –exclude ‘recording’ -f – $HOME/.nx | gzip -c >nxdir.tar.gz
Other pieces of information that could help can be gathered running the commands:
$ xmodmap -pke > xmodmap.txt
$ xprop -root | grep XKB > xprop.txt
Please note that a new version (4.2.17) is available. Let we know if you find the same problem after the upgrade.